Add meetingname to meetbot log files.
Add meetingname to meetbot log files.

Change-Id: Ic0f9e1fa3af5ff7367e7580091808d77842369c7
Reviewed-on: https://review.openstack.org/11750
Reviewed-by: Clark Boylan <635fc31d01fa593720982fa0568e87170cedbe2c@gmail.com>
Approved: James E. Blair <e81a02a9d6405977f63a769d9f6ec8ed9d924325@inaugust.com>
Tested-by: Jenkins

open-switch/infra_puppet-meetbot,open-switch/infra_puppet-meetbot