Call RootCmd's persistentPreRun from svc cmd

Currently the service command overwrites the RootCmd's persistent pre
run.  Now it will run the rootcmd's persistent pre run after it runs
its own.

cmd/minikube/cmd/service.go

@@ -49,6 +49,8 @@ var serviceCmd = &cobra.Command{
 			os.Exit(1)
 		}
 		serviceURLTemplate = t
+
+		RootCmd.PersistentPreRun(cmd, args)
 	},
 	Run: func(cmd *cobra.Command, args []string) {
 		if len(args) == 0 || len(args) > 1 {