node: added persistent storage configuration

Added persistent storage configuration on modified files
and directories when executed on oVirt Node / RHEV-H

Change-Id: I67afe1d994437eac841cc4217ed39f68d5b12374
Bug-Url: https://bugzilla.redhat.com/1151339
Signed-off-by: Sandro Bonazzola <sbonazzo@redhat.com>