Change in vdsm[master]: xen: do not attempt to read underlying device info

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Change subject: xen: do not attempt to read underlying device info
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Patch Set 1:

Build Successful

http://jenkins.ovirt.org/job/vdsm_master_unit_tests_gerrit/9688/ : SUCCESS

http://jenkins.ovirt.org/job/vdsm_master_unit_tests_gerrit_el/8755/ : SUCCESS

http://jenkins.ovirt.org/job/vdsm_master_pep8_gerrit/9541/ : SUCCESS