add fact that gives ipa role

A fact giving the current role (master,replica,client), should be useful.

With this fact we can be aware of state when manifest application is starting. And so we will be able to :

• change a replica to master (useful during Business Continuity Plan if original master is destroyed)
• send error message if operator modify data in an unallowed manner.

This is important because with IAC way of life, if i modify parameter value, i expect it will be applied on system accordingly. With the current version of module, if i change role from master to replica the run will fail or worst damage the system. And that should not happen.