move test logger to shared file

client/driver/driver_test.go

@@ -0,0 +1,10 @@
+package driver
+
+import (
+	"log"
+	"os"
+)
+
+func testLogger() *log.Logger {
+	return log.New(os.Stderr, "", log.LstdFlags)
+}

client/driver/exec_test.go

@@ -1,8 +1,6 @@
 package driver
 
 import (
-	"log"
-	"os"
 	"testing"
 	"time"
 
@@ -10,10 +8,6 @@ import (
 	"github.com/hashicorp/nomad/nomad/structs"
 )
 
-func testLogger() *log.Logger {
-	return log.New(os.Stderr, "", log.LstdFlags)
-}
-
 func TestExecDriver_Fingerprint(t *testing.T) {
 	d := NewExecDriver(testLogger())
 	node := &structs.Node{