Add #openstack-tc channel to accessbot
Add #openstack-tc channel to accessbot

Per I9430273aac72441dd843bc9f9178f4a217685f82 a new #openstack-tc
has been registered to serve as a place for the OpenStack Technical
Committee to engage in several scheduled "office hours" sessions
each week.

Change-Id: Ibecb530f85000f67c3b3bd48210a47bac91b7c3d

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