Reset the DPL model for oslo project

As per the DPL model policy, we need to reset the
DPL model and its liaisons every cycle[1]. As per
process, oslo team either needs to opt-in the DPL
model for the next cycle or have the PTL in coming
election.

[1] https://governance.openstack.org/tc/reference/distributed-project-leadership.html#dpl-model-liaison-duration

Change-Id: Id7eac2122dd1197564636a8a5f96e5d328113897

reference/projects.yaml

@@ -1778,30 +1778,10 @@ OpenStackSDK:
       repos:
         - openstack/shade
 oslo:
-  leadership_type: distributed
-  liaisons:
-    release:
-      - name: Daniel Bengtsson
-        irc: damani
-        email: dbengt@redhat.com
-      - name: Takashi Kajinami
-        irc: tkajinam
-        email: kajinamit@oss.nttdata.com
-    tact-sig:
-      - name: Ghanshyam Mann
-        irc: gmann
-        email: gmann@ghanshyammann.com
-    security:
-      - name: Daniel Bengtsson
-        irc: damani
-        email: dbengt@redhat.com
-    tc-liaison:
-      - name: Ghanshyam Mann
-        irc: gmann
-        email: gmann@ghanshyammann.com
-      - name: Goutham Pacha Ravi
-        irc: gouthamr
-        email: gouthampravi@gmail.com
+  ptl:
+    name: APPOINTMENT NEEDED
+    irc: No nick supplied
+    email: example@example.org
   irc-channel: openstack-oslo
   service: Common libraries
   mission: >