sort regions by name

builder/amazon/common/regions.go

@@ -3,9 +3,9 @@ package common
 // IsValidRegion returns true if the supplied region is a valid AWS
 // region and false if it's not.
 func ValidateRegion(region string) bool {
-	var regions = [11]string{"us-east-1", "us-west-2", "us-west-1", "eu-west-1",
-		"eu-central-1", "ap-southeast-1", "ap-southeast-2", "ap-northeast-1",
-		"sa-east-1", "cn-north-1", "us-gov-west-1"}
+	var regions = [11]string{"ap-northeast-1", "ap-southeast-1", "ap-southeast-2",
+		"cn-north-1", "eu-central-1", "eu-west-1", "sa-east-1",
+		"us-east-1", "us-gov-west-1", "us-west-1", "us-west-2"}
 
 	for _, valid := range regions {
 		if region == valid {