Add GroupDefinition service. Update subscriptions to not have a group name when their group is deleted. Amend: Rebase to HEAD of 13.2.1. Change-Id: I817ca1912f76ccf347907ddb12e3f6fd8de7e5aa Former-commit-id: 464b46dd4f4af60dbeb917f65c18c876d712e4ad
Change-Id: I96622e8f1d2236ade47d4c5a11ad41b750bc7962 Former-commit-id: da8f6de9ae2b897163b465c045114fbd9ebec6e8
Former-commit-id: b535a90fb25287945485c10b3c85749c11285171