Remove Registered Users refs/meta/config perms

We can limit change creation on refs/meta/config to only trusted users
as well as the sets of users inherited from "Public Projects". This
should help reduce some spam.

Change-Id: I5de387f118f7d93245e2f5826a8ae4e7e2711886

groups

diff --git a/groups b/groups
index a4b3703..ee36a45 100644
--- a/groups
+++ b/groups
@@ -2,7 +2,7 @@
 #
 24570b0b94101debd911e621add4bd51ac3fc348                      	gerrit-release-creators
 b49f61711e6c0148f9f4d90702015bb894289be9                      	gerrit-trusted-contributors
+c5cb3f17d8e1ca400dfd4dd850d9964aa561c15d                      	trusted-contributors
 global:Change-Owner                                           	Change Owner
 global:Project-Owners                                         	Project Owners
-global:Registered-Users                                       	Registered Users
 google:AI2Pq9rwJtXWrKQ9Q62CcHSid7ngIF2hCfJ4bSpVquX_P2z5kFM6v9s	google/gerritcodereview-maintainers@googlegroups.com

project.config

diff --git a/project.config b/project.config
index 565c827..6f781b9 100644
--- a/project.config
+++ b/project.config
@@ -25,7 +25,9 @@
 [submit]
 	mergeContent = true
 [access "refs/for/refs/meta/config"]
-	push = group Registered Users
-	pushMerge = group Registered Users
+	push = group gerrit-trusted-contributors
+	push = group trusted-contributors
+	pushMerge = group gerrit-trusted-contributors
+	pushMerge = group trusted-contributors
 [allowSuperproject "gerrit"]
 	matching = refs/heads/*:refs/heads/*