And clean up the API mess while we are at it. Treat the key as an opaque
value that users shouldn't depend on.
Besides the improved code clarity and API layout, this will help diagnose
'key error' issues, since we'll see an object name instead of UUID which
is hard to trace back.
These calls save us a few API lookups, but are not supported by all
libvirt versions.
Since these bits were getting quite large, move them all to a separate
pollhelpers file.
However listAllInterfaces is returning an empty list for now, so we
disable the check: https://bugzilla.redhat.com/show_bug.cgi?id=982014
Cole Robinson