Fix error of CDH plugin scale up more than one node
Fix error of CDH plugin scale up more than one node

When scale up a CDH-5.4.0 cluster with more than one additional node,
there is an internal server error of Cloudera manager. This fix adds
a sleep between each thread posts "deployClientConfig" to cloudera
manager and then it works.

Change-Id: Ib541fd9b0e735e5055db96782eb461d4de4aea93
Closes-Bug: 1643937

openstack/sahara,openstack/sahara,tellesnobrega/sahara,tellesnobrega/sahara