Add tacker liberty to gerrit bot
Add tacker liberty to gerrit bot

Included tacker liberty branch as part of gerritbot event triggers.

Change-Id: Id3194dc06b56fea4d4d957aa9e71feef1f871f44

openstack-infra/project-config,noorul/os-project-config,dongwenjuan/project-config,noorul/os-project-config,openstack-infra/project-config,Tesora/tesora-project-config,dongwenjuan/project-config,Tesora/tesora-project-config