Allow registered users to vote for backport candidates

Registered users do not have ACL rights to -1..+1 on the
Backport-Candidate label. This patch grants them voting rights.

Change-Id: If4d7048aee18f74e81d1455334028fc65a67087f

gerrit/acls/openstack/octavia-dashboard.config

@@ -1,6 +1,7 @@
 [access "refs/heads/*"]
 abandon = group octavia-dashboard-core
 label-Backport-Candidate = -2..+2 group octavia-dashboard-core
+label-Backport-Candidate = -1..+1 group Registered Users
 label-Code-Review = -2..+2 group octavia-dashboard-core
 label-Verified = -1..+1 group octavia-ci
 label-Workflow = -1..+1 group octavia-dashboard-core

gerrit/acls/openstack/octavia-lib.config

@@ -1,6 +1,7 @@
 [access "refs/heads/*"]
 abandon = group octavia-lib-core
 label-Backport-Candidate = -2..+2 group octavia-lib-core
+label-Backport-Candidate = -1..+1 group Registered Users
 label-Code-Review = -2..+2 group octavia-lib-core
 label-Verified = -1..+1 group octavia-ci
 label-Workflow = -1..+1 group octavia-lib-core

gerrit/acls/openstack/octavia.config

@@ -4,6 +4,7 @@ pushMerge = group octavia-release
 [access "refs/heads/*"]
 abandon = group octavia-core
 label-Backport-Candidate = -2..+2 group octavia-core
+label-Backport-Candidate = -1..+1 group Registered Users
 label-Code-Review = -2..+2 group octavia-core
 label-Verified = -1..+1 group octavia-ci
 label-Workflow = -1..+1 group octavia-core

gerrit/acls/openstack/python-octaviaclient.config

@@ -1,6 +1,7 @@
 [access "refs/heads/*"]
 abandon = group octavia-client-core
 label-Backport-Candidate = -2..+2 group octavia-client-core
+label-Backport-Candidate = -1..+1 group Registered Users
 label-Code-Review = -2..+2 group octavia-client-core
 label-Verified = -1..+1 group octavia-ci
 label-Workflow = -1..+1 group octavia-client-core