The hash table returned by qemuMonitorGetAllBlockJobInfo is organized by
the frontend name (which skipps the 'drive-' prefix). While our code
properly matches the jobs to the disk, qemu needs the full job name
including the 'drive-' prefix to be able to identify jobs.

Fix this by adding an argument to qemuMonitorGetAllBlockJobInfo which
does not modify the job name before filling the hash.

This fixes a regression where users would not be able to cancel/pivot
block jobs after restarting libvirtd while a blockjob is running.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>