Integrated customizable bash prompt

Get a nice configurable shell prompt for all nodes... YEAH!
This is a followup pull request after discussion on https://github.com/crowbar/barclamp-deployer/pull/219
So than show me just a single resource that does exactly that. And anyways we don't need to care about it. sh.shrc.local does not exist before and even if a user wants to customize functionality there is still the local bashrc and the ~/.bashrc