Do not mark refstack repos as retired

The RefStack team was shut down as a project and its repos were moved
under the Interop WG. Patch Ife8b48c4da05782657086858c77434ba12bba4b2
marked this team as "legacy", but incorrectly also marked those active
repos as retired.

Since the repos are not retired, just moved under a different ownership
[0], this drops them from the legacy project list as retired repos.

[0] https://opendev.org/openstack/governance/src/branch/master/reference/foundation-board-repos.yaml#L3

Change-Id: I126a6480baefc81ef55b9b9297aafa849883191b
Signed-off-by: Sean McGinnis <sean.mcginnis@gmail.com>

reference/legacy.yaml

@@ -1560,19 +1560,6 @@ RefStack:
     RefStack is a test result collection and reporting service to support the
     Interop Working Group interoperability testing process.
   url: https://wiki.openstack.org/wiki/RefStack
-  deliverables:
-    refstack:
-      retired-on: 2018-08-10
-      repos:
-        - openstack/refstack
-    refstack-client:
-      retired-on: 2018-08-10
-      repos:
-        - openstack/refstack-client
-    python-tempestconf:
-      retired-on: 2018-08-10
-      repos:
-        - openstack/python-tempestconf
 
 Release Management:
   partial: yes