Get rid of exec.cmd struct and setuid file

client/driver/executor/exec.go

@@ -70,7 +70,7 @@ type Executor interface {
 
 	// Command provides access the underlying Cmd struct in case the Executor
 	// interface doesn't expose the functionality you need.
-	Command() *cmd
+	Command() *exec.Cmd
 }
 
 // Command is a mirror of exec.Command that returns a platform-specific Executor
@@ -100,17 +100,3 @@ func OpenId(id string) (Executor, error) {
 	}
 	return executor, nil
 }
-
-// Cmd is an extension of exec.Cmd that incorporates functionality for
-// re-attaching to processes, dropping priviledges, etc., based on platform-
-// specific implementations.
-type cmd struct {
-	exec.Cmd
-
-	// Resources is used to limit CPU and RAM used by the process, by way of
-	// cgroups or a similar mechanism.
-	Resources structs.Resources
-
-	// RunAs may be a username or Uid. The implementation will decide how to use it.
-	RunAs string
-}