Drop xmlutils

It appears that the security issues that this module tried to patch are
now fixed in better way upstream. Let's drop it.

See http://lists.openstack.org/pipermail/openstack-dev/2014-September/047368.html for details.

Change-Id: I28109a57de48406ef163bf64b9e0d2d3feaf2bcd
Merge "Drop xmlutils"