Add nfs group to OSEv3:vars

Fixes #2129

inventory/byo/hosts.aep.example

@@ -6,6 +6,7 @@ masters
 nodes
 etcd
 lb
+nfs
 
 # Set variables common for all OSEv3 hosts
 [OSEv3:vars]

inventory/byo/hosts.ose.example

@@ -6,6 +6,7 @@ masters
 nodes
 etcd
 lb
+nfs
 
 # Set variables common for all OSEv3 hosts
 [OSEv3:vars]