Add new and cleanup existing Admin tests

- Covert to assertj
- Clean up existing tests
- Make edit homepage test work
- Add new tests
- Add Feature annotations
- Move chunky repeated text to the test file generator
rbhz1116688 - clear HRoleAssignmentRule table after test
Move tmx test text chunk to file

Also clean up some review comments
Merge pull request #526 from zanata/assertj-admin-tests

Add new and cleanup existing Admin tests