Change in vdsm[master]: vm: pre-validate disks for snapshot

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Change subject: vm: pre-validate disks for snapshot
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Patch Set 3:

Build Successful

http://jenkins.ovirt.org/job/vdsm_unit_tests_gerrit/4938/ : SUCCESS

http://jenkins.ovirt.org/job/vdsm_unit_tests_gerrit_el/4052/ : SUCCESS

http://jenkins.ovirt.org/job/vdsm_pep8_gerrit/4862/ : SUCCESS