Fill VDSM volumes with zeros before using them for the first time
Fill VDSM volumes with zeros before using them for the first time

VDSM does not initialize iSCSI volumes to clean state and that
causes issues when trying to read the metadata from it. The agent
fails to parse random blocks since there are some random data
and the checksum does not match.

Change-Id: Ifa35e575c7e9405474562813aaa56d71b27791d6
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1238823
Signed-off-by: Martin Sivak <361315d85e190db42db95eaca639c05fa7701076@redhat.com>

oVirt/ovirt-hosted-engine-ha,oVirt/ovirt-hosted-engine-ha,oVirt/ovirt-hosted-engine-ha,oVirt/ovirt-hosted-engine-ha