Appoint Shengqin Feng as Zun PTL

Shengqin Feng sent email about their late candidacy
for Zun PTL position of Xena Cycle
- http://lists.openstack.org/pipermail/openstack-discuss/2021-March/020998.html

Change-Id: I55c67f9c14a744bf258221f47d91f5aac8afef02

reference/projects.yaml

@@ -3352,9 +3352,11 @@ zaqar:
       - belmoreira
 zun:
   ptl:
-    name: APPOINTMENT NEEDED
+    name: Feng Shengqin
     irc: No nick supplied
-    email: example@example.org
+    email: feng.shengqin@zte.com.cn
+  appointed:
+    - xena
   irc-channel: openstack-zun
   service: Containers service
   mission: >