Add tests to cover flavors

This patch set adds tests to cver the flavors API [0].
Test lists, gets, creates, updates, and deletes flavors.
Part of "Increase Neutron RBAC Coverage" initiative [1]

[0] https://developer.openstack.org/api-ref/network/v2/index.html#networking-flavors-framework-v2-0-current-flavor-service-profile
[1] https://storyboard.openstack.org/#!/story/2002641

Change-Id: I526d1567b715c0a57e73fa6645d8a98b9b45c62e
Story: 2002641
Task: 22316
1 file changed