B #5288: premigrator does not fail if images have been deleted from vcenter
B #5288: premigrator does not fail if images have been deleted from
vcenter

(cherry picked from commit 96f1d9d3365d4f04b0564fdd4be80a6b156d8fac)

OpenNebula/one,OpenNebula/one,baby-gnu/one,atodorov-storpool/one,OpenNebula/one,abelCoronado93/one,atodorov-storpool/one,atodorov-storpool/one,abelCoronado93/one,atodorov-storpool/one,OpenNebula/one,OpenNebula/one,OpenNebula/one,abelCoronado93/one,baby-gnu/one,atodorov-storpool/one,atodorov-storpool/one,baby-gnu/one,abelCoronado93/one,atodorov-storpool/one,abelCoronado93/one,baby-gnu/one,OpenNebula/one,abelCoronado93/one,OpenNebula/one,baby-gnu/one,abelCoronado93/one,abelCoronado93/one,atodorov-storpool/one,baby-gnu/one,OpenNebula/one,baby-gnu/one,baby-gnu/one,atodorov-storpool/one