git url checking support private

[caowei]

git url checking support private

solumuser@ubuntu14044:/opt/stack/solum/examples/apps$ solum app create --app-file python2_app.yaml
ERROR: Provide the git uri in the following format: https://github.com/<USER>/<REPO>.git
solumuser@ubuntu14044:/opt/stack/solum/examples/apps$ cat python2_app.yaml
version: 1
name: cherrypy
description: python web app
languagepack: python
source:
  repository: http://192.168.132.130/root/solum-python-sample-app.git
  revision: master
workflow_config:
  test_cmd: ./unit_tests.sh
  run_cmd: python app.py
trigger_actions:
- unittest
- build
- deploy
ports:
- 80