Updated openstack/openstack
Project: openstack/sahara  f24ae9e7b09a98792c8785ad1f2e26d281dfdf32

Added validation check for number of datanodes

Now if user would want to create a cluster with number of datanodes
less than dfs.replication, he will be warned and a validation error will be raised.

Change-Id: I396cf218001bde20f6f0b38e07784adf415548a5
Closes-bug: #1330739