When filtering API calls using tags along with other filter parameters
the API could fail with an "Entity has no property" errors.
Also when filtering with tags that contain a comma separated list,
the API would mis-interpret the list of tags as a single string.
This patch resolves both of these issues and adds functional test
coverage for these use cases.
Change-Id: I7153ed9a6214ce352b2ac115001f7f6134d95b39
Story: 2006914
Task: 37559
a736f98a7f