Change in vdsm[master]: volume: support multi line metadata values

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Change subject: volume: support multi line metadata values
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Patch Set 1:

Build Successful

http://jenkins.ovirt.org/job/vdsm_master_unit_tests_gerrit/9811/ : SUCCESS

http://jenkins.ovirt.org/job/vdsm_master_unit_tests_gerrit_el/8873/ : SUCCESS

http://jenkins.ovirt.org/job/vdsm_master_pep8_gerrit/9658/ : SUCCESS

http://jenkins.ovirt.org/job/vdsm_master_storage_functional_tests_localfs_ge... : SUCCESS