Delete stale routing instance and acl objects when schema transformer starts. This could happen if any virtual networks were deleted while schema transformer was down.

Change-Id: Ie29434adfb031500d5174ff0984a87ece7d59f0d
Closes-Bug: 1336637
Merge "Delete stale routing instance and acl objects when schema transformer starts. This could happen if any virtual networks were deleted while schema transformer was down."