Skip test_volume_boot_pattern until bug 1373513 is fixed

Between the races to delete a volume and hitting timeouts because things
are hanging with lvm in Cinder and the various SSH timeouts, this test
is a constant burden.

The SSH problems have been around for a long time and don't seem to be
getting any new attention.

The Cinder volume delete hangs have also been around for awhile now and
don't seem to be getting much serious attention, so until the Cinder
volume delete hangs are fixed (or at least getting some serious
attention), let's just skip this test scenario.

Related-Bug: #1373513
Related-Bug: #1370496
Related-Bug: #1349617

Change-Id: Idb50bcdbc9683d322e9292abf50404e885a11a8e
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 "Skip test_volume_boot_pattern until bug 1373513 is fixed"
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"