Revert "CA-98090: Block SXM when VM cannot match any bridge names on destination"
CA-149823: Reinstate bridge_not_available error for b/w compatibility

Signed-off-by: Si Beaumont <simon.beaumont@citrix.com>
Merge pull request #2014 from simonjbeaumont/ca-149823-tr3

Revert "CA-98090: Block SXM when VM cannot match any bridge names on destination..."