Change in vdsm[master]: utils: Use ovirt node for persist and unpersist files

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Change subject: utils: Use ovirt node for persist and unpersist files
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Patch Set 4:

Build Successful

http://jenkins.ovirt.org/job/vdsm_master_unit_tests_gerrit_el/11601/ : SUCCESS

http://jenkins.ovirt.org/job/vdsm_master_unit-tests_created/12545/ : SUCCESS

http://jenkins.ovirt.org/job/vdsm_master_pep8_gerrit/12390/ : SUCCESS