Host group should be OSEv3 not OSv3

Following on from #1107 the host group's name is OSEv3 and not OSv3

playbooks/adhoc/bootstrap-fedora.yml

@@ -1,4 +1,4 @@
-- hosts: OSv3
+- hosts: OSEv3
   gather_facts: false
   tasks:
     - name: install python and deps for ansible modules