Add logging to #openstack-meeting-3

Add eavesdrop logging (and ability to log meetings) to a new meeting
channel, #openstack-meeting-3. That channel was registered with ChanServ
and openstackinfra was granted founder rights on it.

Change-Id: I0cfd8e7275c8d7ae21017f987e4bdfc07068968f
Merge "Add logging to #openstack-meeting-3"