[PRD-2323] Fix cinder-volume ceph init on ubuntu

* distorize CEPH_ARGS in cinder::volume::ceph
* convert parameters to cinder::params
* remove un-used params from ceph::params
* removes some not needed parts left over from 0fdb733

Resolves: PRD-2323

Testing status: 
Centos HA - pass
Ubuntu - testing