Issue when running make rpm in Fedora 18 without root access.

The ConfigWriterTests:testPersistantBackup fails, because it uses libvirt's
createNetwork and removeNetwork functions, but libvirt requires root access.
The current solution is to use monkey patch, and simply nullify the create
and remove network functions. The test now passes, but this might
not be the ideal solution to the problem.

Signed-off-by: Assaf Muller <amuller@redhat.com>
Change-Id: Ic2e0076e146c57228eee3cca8b57948fb82bcbb7
Reviewed-on: http://gerrit.ovirt.org/11545
Reviewed-by: Antoni Segura Puimedon <asegurap@redhat.com>
Reviewed-by: Dan Kenigsberg <danken@redhat.com>
Tested-by: Dan Kenigsberg <danken@redhat.com>