Add new troubleshooting bugs tag
Add new troubleshooting bugs tag

The rationale is that we would have a single tag to track all
bugs that are about admin and user ease of use, logging quality,
and debuggability.

Change-Id: Ie42e08c924c9e742bdc6d9f4b68bdfbd1a622ba4

openstack/neutron,MaximNevrov/neutron,igor-toga/local-snat,cloudbase/neutron,cloudbase/neutron,igor-toga/local-snat,wolverineav/neutron,eayunstack/neutron,klmitch/neutron,eayunstack/neutron,noironetworks/neutron,huntxu/neutron,dims/neutron,mahak/neutron,bigswitch/neutron,dims/neutron,huntxu/neutron,wolverineav/neutron,noironetworks/neutron,klmitch/neutron,mahak/neutron,bigswitch/neutron,openstack/neutron,sebrandon1/neutron,openstack/neutron,MaximNevrov/neutron,mahak/neutron,sebrandon1/neutron