tasks: loadDumpedTasks shouldn't queue tasks

loadDumpedTasks should just load the tasks in the unqueuedTasks list.
It is a subsequent call to recoverDumpedTasks that is in charge to queue
the recovery (queueRecovery and _queueTask).

Change-Id: I0f7386f0944f711a1b0a440e86b7ef4bfabc46d7
Signed-off-by: Federico Simoncelli <fsimonce@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/27041
Reviewed-by: Vinzenz Feenstra <vfeenstr@redhat.com>
Reviewed-by: Xavi Francisco <xfrancis@redhat.com>
Reviewed-by: Saggi Mizrahi <smizrahi@redhat.com>