remove redundant negative flavor admin tests

These tests are now in the nova functional test tree, which is a
better place to put them. The nova tests go a step further and
actually verify the database is correct after these land.

Depends-On: I0cc37c0a49e26b965403bb3ed59ff4569f0952f1

Change-Id: I37a5ccc0f1ff0a62f0f097e80620ec1883ba61f3
1 file changed