Add missing call to prepareImage
Add missing call to prepareImage

adding the missing call to prepareImage for
allowing to write the image imported from the OVA
to an iSCSI or FC storage.
On NFS storage it worked also without this call but
it's required on iSCSI.

Change-Id: If42529e6f02b5803e0c2e1fd8d0ab7550b1402dd
Bug-Url: https://bugzilla.redhat.com/1222058
Signed-off-by: Sandro Bonazzola <fcb014d63786651910af5db2ecc5316c668188ef@redhat.com>

oVirt/ovirt-hosted-engine-setup,oVirt/ovirt-hosted-engine-setup