Supply missing required param to all in one example

This commit adds the parameter proxy_local_net_ip to
the swift::proxy class for the all in one example.

This parameter had been changed to be required in a previous commit,
but the example had not been updated.

examples/all.pp

@@ -69,6 +69,7 @@ class { 'swift::ringbuilder':
 
 # TODO should I enable swath in the default config?
 class { 'swift::proxy':
+  proxy_local_net_ip => $swift_local_net_ip,
   account_autocreate => true,
   require            => Class['swift::ringbuilder'],
 }