Update the bug triage policy for neutron DocImpact bugs affecting
openstack-manuals.
The two policy additions are:
1. Tagging the bug for the appropriate guide. This will assist the
openstack-manuals team with their part of the triage process.
2. Removing neutron from affected projects if the bug only affects
openstack-manuals. This will help reduce clutter in the neutron bug queue.
Change-Id: Iac2dd10f1476cde0843c356f0d161b5a59943c99
792cc0fddc