Chef Pacemaker cookbook support for RHEL/CentOS and Chef 12

[ovaistariq]

I have reworked the cookbooks to accomplish the following:

• Make them work with RHEL/CentOS versions 6.x
• Make them work with latest release of Chef 11 and 12
• Add test-kitchen tests to test a functioning two node cluster using Vagrant.
  This is basically the second and last part of the earlier issue I had opened:
  crowbar/barclamp-pacemaker#202

@aspiers suggested that I rebase my changes off crowbar-ha instead of barclamp-pacemaker.