cloud::spof: add red hat support

Use another puppet module to configure Pacemaker with Corosync and allow
to run Ceilometer Agent Central and Heat Engine in HA on Red Hat
systems.
Pacemaker / RH: add cluster password support

For security reasons, allow to change the default password.

Signed-off-by: Emilien Macchi <emilien.macchi@enovance.com>
Puppetfile: add puppetlabs-firewall to modules

This module is needed for puppet-pacemaker and also will be used later
to introduce network security.
spof: use a < 15 characters for cluster name
spof: create resources on RH systems

For now, the provider does not work, and it needs some investigation.
During this time, let's simply use the exec provider.
Merge pull request #500 from enovance/puppet-pacemaker

cloud::spof: add red hat support