unified params.pp and minor changes in rhmk parameters (all input parameters are now explicit in class declaration)

This reverts commit 13860f75.

Dir ceph/ moved from profile to resources; var cephvolume renamed in cephpool; manifest cephvolume.pp renamed in cephpool.pp; Related modifications due to the rename.

added possibility of changing ip addresses of single database node. Requiring percona module > 1.0.0

insered a variable (default on classic hostname) in rhmk role for changing hostname in /etc/rabbitmq/rabbitmq-env.conf