Kill finally, use addCleanUp

Remove the finally usage for cleanup in the floating_ips tests and
in the test_services tests.

The finally blocks may try to delete resources which are even does not
exists, and or referencing to an undefined variables, which could hide
the original exceptions from the resource creation operations.

Change-Id: I23740553c793dcb2904a561b8f2ce801137e32d8
3 files changed