Skip flavor_access_add/remove related tests

This patch add skip decorator for flavor_access_add/remove related tests.
After use project instead of tenant in the flavor_access extensions, will
fix those tests.

Related patch:
https://review.openstack.org/#/c/58450/

Change-Id: Ibf741059c3a7a94543f1a2230fe7048692e1db0c
Related-Bug: #1265416
2 files changed