Improve formatting with 'go fmt' as stated in CONTRIBUTING.md

As 'go fmt' doesn't support verifying files in multiple directories,
it's probably a good idea to run it on all '*.go' files from time to
time with something like this:

  find . -name "*.go" | xargs dirname | sort -u | xargs -n 1 echo go fmt

commands.go

@@ -30,7 +30,7 @@ import (
 
 var (
 	GITCOMMIT string
-	VERSION string
+	VERSION   string
 )
 
 func (cli *DockerCli) getMethod(name string) (reflect.Method, bool) {

commands_test.go

@@ -152,7 +152,6 @@ func TestRunWorkdirExists(t *testing.T) {
 
 }
 
-
 func TestRunExit(t *testing.T) {
 	stdin, stdinPipe := io.Pipe()
 	stdout, stdoutPipe := io.Pipe()

docker/docker.go

@@ -16,7 +16,7 @@ import (
 
 var (
 	GITCOMMIT string
-	VERSION string
+	VERSION   string
 )
 
 func main() {

sysinit.go

@@ -27,10 +27,9 @@ func setupWorkingDirectory(workdir string) {
 	if workdir == "" {
 		return
 	}
-    syscall.Chdir(workdir)
+	syscall.Chdir(workdir)
 }
 
-
 // Takes care of dropping privileges to the desired user
 func changeUser(u string) {
 	if u == "" {