Remove release-tools from Release Management

The Release Management Team has retired the
openstack-infra/release-tools repository, so it should no longer be
tracked as an official deliverable. Move it to the legacy
deliverables list.

Change-Id: Idd17c32bdc851d60d0c9b3815880d07b465418eb
Depends-On: https://review.openstack.org/579185

reference/legacy.yaml

@@ -1423,6 +1423,14 @@ Packaging-deb:
       repos:
         - openstack/deb-zaqar-ui
 
+Release Management:
+  partial: yes
+  deliverables:
+    release-tools:
+      retired-on: 2018-06-29
+      repos:
+        - openstack-infra/release-tools
+
 Security:
   url: https://wiki.openstack.org/wiki/Security
   partial: yes

reference/projects.yaml

@@ -3237,9 +3237,6 @@ Release Management:
     release-test:
       repos:
         - openstack/release-test
-    release-tools:
-      repos:
-        - openstack-infra/release-tools
     releases:
       repos:
         - openstack/releases