Turn alembic upgrade steps into async operations.

playbooks/manual/upgrade/datanommer.yml

@@ -110,6 +110,8 @@
     command: /usr/bin/alembic upgrade head
     args:
       chdir: /usr/share/datanommer.models/
+    async: 20000
+    poll: 60
 
   - name: And... start the backend again
     service: name="fedmsg-hub" state=started

playbooks/manual/upgrade/fmn.yml

@@ -65,10 +65,14 @@
   tasks:
   - name: Stop the notification backend
     service: name="fedmsg-hub" state=stopped
+
   - name: Upgrade the database
     command: /usr/bin/alembic upgrade head
     args:
       chdir: /usr/share/fmn.lib/
+    async: 20000
+    poll: 60
+
   - name: And... start the backend again
     service: name="fedmsg-hub" state=started