Fix network passing for cluster-template-create

The fix adds the following:

 * Support neutron_management_network in cluster-template-create
 * Client prints a warning message if user passed an unrecogizable
   parameter into node group or cluster template, or in cluster.

Closes-bug: #1325609
Closes-bug: #1271147
Change-Id: I38f131897396bf0ab1e42cd06a1dc3d50ba624c6
Merge "Fix network passing for cluster-template-create"