Add nfs option and servicenet_ip variables to example secrets file.

secrets.vault.yml.example

@@ -21,9 +21,19 @@ rackspace_username: ''
 
 # Overwritten NFS variables (see the nfs_server and nfs_client roles for details)
 nfsserver: ''
+# NFS mount point on clients
 nfsmount: ''
-nfsdomain: ''
+# NFS share on the host
 nfspath: ''
+# Options to rpc.nfsd
+nfsdopts: ''
+# Domain for idmapd
+nfsdomain: ''
+# Client options
+nfsoptions: ''
+
+servicenet_ip: ''
+
 
 # Overwritten jupyterhub variables (see jupyterhub role for details)
 configproxy_auth_token: ''