On update_tags, clean up tags from the requested resource only

There was a bug in I0179a3616689f39d93c337c730283e21a01677cf that made
the service plugin to clean up removed tags from all resources, not just
the one requested.

Change-Id: Ifbe13102ebd903e01eb28a00d97e7e94d1a0e0b1
Closes-Bug: #1673086
1 file changed
tree: 2e48dffe24790c08c5ef92e891b9d8e442022ddc
  1. neutron/