tree 0282f10141b1c21cd2312e3394512e8d004bce27
parent 9d99219f3e3f6ebb48cf6823b677c27609c52072
author ricolin <rico.lin@easystack.cn> 1524028093 +0800
committer ricolin <rico.lin@easystack.cn> 1525953596 +0800

Add external_ref test for update stack

Add test to make sure after we update a stack, external resource will
still presented.

Depends-On: https://review.openstack.org/#/c/557175/
Story: #1756269

Change-Id: I5eccc680caebedbec261407d619618d478fc0b28