ircbot: add #openstack-ansible-sig to bots

This change will add our IRC bots to the newly formed Ansible SIG,
in addition, it removes #dox in order to stay within the 120
channel limit.

The dox project has not seen a commit in 2 years and the channel
is pretty much empty/abanonded.

Change-Id: I3acd3cb77a9f71eb80921f4cbf2162113f40efea

hiera/common.yaml

@@ -14,6 +14,7 @@ statusbot_channels:
 - oooq
 - openstack
 - openstack-ansible
+- openstack-ansible-sig
 - openstack-anvil
 - openstack-auto-scaling
 - openstack-bacon
@@ -112,7 +113,6 @@ meetbot_channels:
 - '#ara'
 - '#cloudkitty'
 - '#congress'
-- '#dox'
 - '#edge-computing-group'
 - '#heat'
 - '#kata-dev'
@@ -124,6 +124,7 @@ meetbot_channels:
 - '#opendev'
 - '#openstack'
 - '#openstack-ansible'
+- '#openstack-ansible-sig'
 - '#openstack-auto-scaling'
 - '#openstack-barbican'
 - '#openstack-blazar'