Final separation of IOProcess and RFH

From now on vdsm will either fully use
remoteFileHandler implementation or
IOProcess implementation for out of process(oop).

Change-Id: Ief85d2dca2d22058c4ed2504e49dc3dd62547532
Signed-off-by: Yeela Kaplan <ykaplan@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/28088
Reviewed-by: Yaniv Bronhaim <ybronhei@redhat.com>
Reviewed-by: Dan Kenigsberg <danken@redhat.com>