Allow change owner to submit changes in all public projects

We already allow change uploaders to submit in the Gerrit project: it
is safe because a maintainer still has to approve any change before it
can be submitted. Let's allow the same in other public projects, such
as java-prettify.

Change-Id: Ie14de571d5072c166914bab6bca86c6014b8ef09

groups

diff --git a/groups b/groups
index 5810703..54bdb36 100644
--- a/groups
+++ b/groups
@@ -5,6 +5,7 @@
 b97887aaa85f9b33a4252e189de8c250dad58037                      	luci_scoped_account
 e076e6ae9e389d476b0dcf1427cca2dcda4f77c6                      	Diffy Cuckoo
 global:Anonymous-Users                                        	Anonymous Users
+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 5f19c35..c3c7c7a 100644
--- a/project.config
+++ b/project.config
@@ -24,6 +24,7 @@
 	label-Verified = -1..+1 group gerrit-trusted-contributors
 	label-Commit-Queue = +0..+2 group luci_scoped_account
 	labelAs-Commit-Queue = +0..+2 group luci_scoped_account
+	submit = group Change Owner
 	submit = group Project Owners
 	submitAs = group luci_scoped_account
 	submit = group luci_scoped_account