update version string trim method to include whitespace

Change-Id: I352811ed70b7ea85c896acb1c6415b5f87f16b8a
Signed-off-by: Jake Sanders <jsand@google.com>

util/util.go

@@ -26,6 +26,7 @@ import (
  "runtime"
  "strconv"
  "strings"
+ "unicode"
 )
 
 // SdkConfigPath tries to return the directory where the gcloud config is
@@ -60,11 +61,10 @@ func DockerClientVersionStrings() (string, string, string, error) {
 
  vstring := string(out)
 
- // Remove any leading/trailing whitespace
- vstring = strings.TrimSpace(vstring)
-
- // Remove any leading/trailing '
- vstring = strings.Trim(vstring, "'")
+ // Remove any leading/trailing whitespace or '
+ vstring = strings.TrimFunc(vstring, func(r rune) bool {
+ return unicode.IsSpace(r) || r == '\''
+ })
 
  ver := strings.Split(vstring, ".")