removing xml from servers.py

this change is the beginning of the tear down of the xml v3 code.
removing xml from servers.py and still passing unit tests means
that we're done with the unit test tear down we need, as nothing
can be touching xml anywhere, as the root controller is no longer
there.

one additional test had to be removed to make this pass.

Part of blueprint remove-v3-xml-api

Change-Id: I7f04255ecc91f2aba045dc0c38992bc6d8a5b82a
Merge "removing xml from servers.py"