[accessbot] Default to running a meetbot in all channels
[accessbot] Default to running a meetbot in all channels

Now that I631e2597bf818c5e4b2f813da14764d2cb55d0ce has merged match
that.

Change-Id: I6a8a1cedd8a83e3e856e8df4aba4d0a584912eb0

openstack-infra/project-config,openstack-infra/project-config