set-pcs-auth-passwd password generation should be deprecated in favour of gdeploy config file

[arrrgi]

Hi, I noted as I was poring through the playbooks that a generic clear text password is created in the set-pcs-auth-passwd.yml via shell command.

This might be better improved by moving this variable up into the configuration file read in by gdeploy as some target environments/users would prefer to use something a little more secure at the onset.

Side note - can we also avoid using "root" for the playbooks? Ansible now supports becoming a user with elevated privileges http://docs.ansible.com/ansible/become.html