WN and CREAM-CE deployment now working

This pull request has been tested on the ZA-MERAKA dev cluster.

The CREAM-CE, headnode and worker node roles have been tested.

A lot of effort has been made to ensure that worker-nodes  have host-based authentication, however there is some work to do to perfect this. 

since this code is now out of development and in testing phase, I am pulling  it back into the main branch.