diff --git a/vendor/github.com/hashicorp/go-getter/README.md b/vendor/github.com/hashicorp/go-getter/README.md
index 80623105f..a35d55bd1 100644
--- a/vendor/github.com/hashicorp/go-getter/README.md
+++ b/vendor/github.com/hashicorp/go-getter/README.md
@@ -21,8 +21,7 @@ URLs. For example: "github.com/hashicorp/go-getter" would turn into a
 Git URL. Or "./foo" would turn into a file URL. These are extensible.
 
 This library is used by [Terraform](https://terraform.io) for
-downloading modules, [Otto](https://ottoproject.io) for dependencies and
-Appfile imports, and [Nomad](https://nomadproject.io) for downloading
+downloading modules and [Nomad](https://nomadproject.io) for downloading
 binaries.
 
 ## Installation and Usage
@@ -233,6 +232,9 @@ The options below are available to all protocols:
   * `checksum` - Checksum to verify the downloaded file or archive. See
     the entire section on checksumming above for format and more details.
 
+  * `filename` - When in file download mode, allows specifying the name of the
+    downloaded file on disk. Has no effect in directory mode.
+
 ### Local Files (`file`)
 
 None
diff --git a/vendor/github.com/hashicorp/go-getter/client.go b/vendor/github.com/hashicorp/go-getter/client.go
index b67bb641c..6e5ab8264 100644
--- a/vendor/github.com/hashicorp/go-getter/client.go
+++ b/vendor/github.com/hashicorp/go-getter/client.go
@@ -232,7 +232,18 @@ func (c *Client) Get() error {
 		// Destination is the base name of the URL path in "any" mode when
 		// a file source is detected.
 		if mode == ClientModeFile {
-			dst = filepath.Join(dst, filepath.Base(u.Path))
+			filename := filepath.Base(u.Path)
+
+			// Determine if we have a custom file name
+			if v := q.Get("filename"); v != "" {
+				// Delete the query parameter if we have it.
+				q.Del("filename")
+				u.RawQuery = q.Encode()
+
+				filename = v
+			}
+
+			dst = filepath.Join(dst, filename)
 		}
 	}
 
diff --git a/vendor/github.com/hashicorp/go-getter/get.go b/vendor/github.com/hashicorp/go-getter/get.go
index c3236f553..e6053d934 100644
--- a/vendor/github.com/hashicorp/go-getter/get.go
+++ b/vendor/github.com/hashicorp/go-getter/get.go
@@ -18,6 +18,8 @@ import (
 	"os/exec"
 	"regexp"
 	"syscall"
+
+	cleanhttp "github.com/hashicorp/go-cleanhttp"
 )
 
 // Getter defines the interface that schemes must implement to download
@@ -49,8 +51,13 @@ var Getters map[string]Getter
 // syntax is schema::url, example: git::https://foo.com
 var forcedRegexp = regexp.MustCompile(`^([A-Za-z0-9]+)::(.+)$`)
 
+// httpClient is the default client to be used by HttpGetters.
+var httpClient = cleanhttp.DefaultClient()
+
 func init() {
-	httpGetter := &HttpGetter{Netrc: true}
+	httpGetter := &HttpGetter{
+		Netrc: true,
+	}
 
 	Getters = map[string]Getter{
 		"file":  new(FileGetter),
diff --git a/vendor/github.com/hashicorp/go-getter/get_git.go b/vendor/github.com/hashicorp/go-getter/get_git.go
index 072813983..6f5d9142b 100644
--- a/vendor/github.com/hashicorp/go-getter/get_git.go
+++ b/vendor/github.com/hashicorp/go-getter/get_git.go
@@ -180,17 +180,34 @@ func (g *GitGetter) fetchSubmodules(dst, sshKeyFile string) error {
 // setupGitEnv sets up the environment for the given command. This is used to
 // pass configuration data to git and ssh and enables advanced cloning methods.
 func setupGitEnv(cmd *exec.Cmd, sshKeyFile string) {
-	var sshOpts []string
+	const gitSSHCommand = "GIT_SSH_COMMAND="
+	var sshCmd []string
+
+	// If we have an existing GIT_SSH_COMMAND, we need to append our options.
+	// We will also remove our old entry to make sure the behavior is the same
+	// with versions of Go < 1.9.
+	env := os.Environ()
+	for i, v := range env {
+		if strings.HasPrefix(v, gitSSHCommand) {
+			sshCmd = []string{v}
+
+			env[i], env[len(env)-1] = env[len(env)-1], env[i]
+			env = env[:len(env)-1]
+			break
+		}
+	}
+
+	if len(sshCmd) == 0 {
+		sshCmd = []string{gitSSHCommand + "ssh"}
+	}
 
 	if sshKeyFile != "" {
 		// We have an SSH key temp file configured, tell ssh about this.
-		sshOpts = append(sshOpts, "-i", sshKeyFile)
+		sshCmd = append(sshCmd, "-i", sshKeyFile)
 	}
 
-	cmd.Env = append(os.Environ(),
-		// Set the ssh command to use for clones.
-		"GIT_SSH_COMMAND=ssh "+strings.Join(sshOpts, " "),
-	)
+	env = append(env, strings.Join(sshCmd, " "))
+	cmd.Env = env
 }
 
 // checkGitVersion is used to check the version of git installed on the system
diff --git a/vendor/github.com/hashicorp/go-getter/get_http.go b/vendor/github.com/hashicorp/go-getter/get_http.go
index dbcb3ab1f..9acc72cd7 100644
--- a/vendor/github.com/hashicorp/go-getter/get_http.go
+++ b/vendor/github.com/hashicorp/go-getter/get_http.go
@@ -36,6 +36,10 @@ type HttpGetter struct {
 	// Netrc, if true, will lookup and use auth information found
 	// in the user's netrc file if available.
 	Netrc bool
+
+	// Client is the http.Client to use for Get requests.
+	// This defaults to a cleanhttp.DefaultClient if left unset.
+	Client *http.Client
 }
 
 func (g *HttpGetter) ClientMode(u *url.URL) (ClientMode, error) {
@@ -57,13 +61,17 @@ func (g *HttpGetter) Get(dst string, u *url.URL) error {
 		}
 	}
 
+	if g.Client == nil {
+		g.Client = httpClient
+	}
+
 	// Add terraform-get to the parameter.
 	q := u.Query()
 	q.Add("terraform-get", "1")
 	u.RawQuery = q.Encode()
 
 	// Get the URL
-	resp, err := http.Get(u.String())
+	resp, err := g.Client.Get(u.String())
 	if err != nil {
 		return err
 	}
@@ -105,7 +113,11 @@ func (g *HttpGetter) GetFile(dst string, u *url.URL) error {
 		}
 	}
 
-	resp, err := http.Get(u.String())
+	if g.Client == nil {
+		g.Client = httpClient
+	}
+
+	resp, err := g.Client.Get(u.String())
 	if err != nil {
 		return err
 	}
diff --git a/vendor/github.com/hashicorp/go-getter/source.go b/vendor/github.com/hashicorp/go-getter/source.go
index 47307ead5..c63f2bbaf 100644
--- a/vendor/github.com/hashicorp/go-getter/source.go
+++ b/vendor/github.com/hashicorp/go-getter/source.go
@@ -49,6 +49,11 @@ func SubdirGlob(dst, subDir string) (string, error) {
 	if err != nil {
 		return "", err
 	}
+
+	if len(matches) == 0 {
+		return "", fmt.Errorf("subdir %q not found", subDir)
+	}
+
 	if len(matches) > 1 {
 		return "", fmt.Errorf("subdir %q matches multiple paths", subDir)
 	}
diff --git a/vendor/vendor.json b/vendor/vendor.json
index e7f74a01e..64d9d4ba3 100644
--- a/vendor/vendor.json
+++ b/vendor/vendor.json
@@ -757,16 +757,16 @@
 			"revisionTime": "2017-06-02T22:43:19Z"
 		},
 		{
-			"checksumSHA1": "aYYfKsxwxF3pz3YqKlmDVxGMrnM=",
+			"checksumSHA1": "wCKbbnwvVEoKAE5TWunloLhErm4=",
 			"path": "github.com/hashicorp/go-getter",
-			"revision": "80eb888f740e980f6585273d48582c74b3a34f88",
-			"revisionTime": "2017-09-05T20:52:06Z"
+			"revision": "994f50a6f071b07cfbea9eca9618c9674091ca51",
+			"revisionTime": "2017-12-04T19:28:26Z"
 		},
 		{
 			"checksumSHA1": "9J+kDr29yDrwsdu2ULzewmqGjpA=",
 			"path": "github.com/hashicorp/go-getter/helper/url",
-			"revision": "80eb888f740e980f6585273d48582c74b3a34f88",
-			"revisionTime": "2017-09-05T20:52:06Z"
+			"revision": "994f50a6f071b07cfbea9eca9618c9674091ca51",
+			"revisionTime": "2017-12-04T19:28:26Z"
 		},
 		{
 			"checksumSHA1": "miVF4/7JP0lRwZvFJGKwZWk7aAQ=",