delete all compute xml tests

part of operation drop xml

Change-Id: I00f1ea08a5e9dbda6e6fe765558100106026a931
part 2 of delete xml

part of removal of xml from tempest

Change-Id: I4218f5db2d6ff42dd208c2c06e4bf2c7baea2f6b
purge xml clients from tempest.clients

This removes the import of xml clients into the tempest clients setup,
now that no XML tests exist this is a safe thing to do.

Change-Id: Ic28d80299f7a7d00a5eada8b70e4423e4f0ac3a4
remove xml_utils and all things that depend on it

This rips out xml_utils, and all the things that depend on it, which takes
out a huge amount of the xml infrastructure in the process.

Change-Id: I9d40f3065e007a531985da1ed56ef4f2e245912e
Merge "delete all compute xml tests"
Merge "part 2 of delete xml"
Merge "purge xml clients from tempest.clients"
Merge "remove xml_utils and all things that depend on it"