Appoint XueFeng as Senlin PTL

XueFeng confirmed ot lead the Senlin for
Zed cycle PTL
- https://etherpad.opendev.org/p/zed-leaderless

Change-Id: Ica22fdfc1ec2fa89a30100388b63455eef1e8ee7

reference/projects.yaml

@@ -2774,12 +2774,13 @@ sahara:
       - belmoreira
 senlin:
   ptl:
-    name: APPOINTMENT NEEDED
+    name: XueFeng Liu
     irc: No nick supplied
-    email: example@example.org
+    email: liu.xuefeng1@zte.com.cn
   appointed:
     - wallaby
     - xena
+    - zed
   irc-channel: senlin
   service: Clustering service
   mission: >