Move xml common code into the common dir

This commit moves tempest.services.compute.xml.common to the proper
location in tempest.common and renames the file to xml_utils.py. This
module was used in every client not just compute so the appropriate
place for this is in the common dir.

Change-Id: I42a8338fd507c1224fa9fd2cdc5c1b0700f7a26a
ceilometer-collector now has errors

need to add this to the dirty list to make forward progress.

In order to make the results more readable we also need a line
break before the log file stanza.

Change-Id: I863a8a30384edf27a4ba761c707b5cf673c1f86e
Merge "Move xml common code into the common dir"
Merge "ceilometer-collector now has errors"