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

This reverts commit 13860f75.

corrected percona variables: mysql_cluster_server as a String andwsrep_node_address rely on getvar instead on facts[]

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.