Add gerrit bot to #openstack-nova.

Change-Id: Id54bf72acf917066de3bbc9ef6f73d7935cbb07c
Reviewed-on: https://review.openstack.org/25742
Reviewed-by: James E. Blair <corvus@inaugust.com>
Approved: Clark Boylan <clark.boylan@gmail.com>
Reviewed-by: Clark Boylan <clark.boylan@gmail.com>
Tested-by: Jenkins
Add gerrit bot to #openstack-qa

Change-Id: I649482280c03282dc9dba8b8262453b31ddda0f3
Reviewed-on: https://review.openstack.org/25745
Reviewed-by: James E. Blair <corvus@inaugust.com>
Approved: Clark Boylan <clark.boylan@gmail.com>
Reviewed-by: Clark Boylan <clark.boylan@gmail.com>
Tested-by: Jenkins