test : delNetwork with bond accumulation.

Added functional test covering behaviour of delNetwork
when creating and deleting a bond.

Change-Id: I12ebeeaff8949e6020dcfcaebaa94f3641b622d5
Signed-off-by: Giuseppe Vallarelli <gvallare@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/17944
Reviewed-by: Dan Kenigsberg <danken@redhat.com>