blockjob: Fix recent BLOCK_JOB_READY regression

Commit bcada37 dropped the (up to now undocumented) members type, len,
offset, speed, breaking tests/qemu-iotests/040 and 041.

Restore and document them.  This fixes 040, and partially fixes 041.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Tested-By: Benoit Canet <benoit@irqsave.net>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

blockjob.c

@@ -270,7 +270,11 @@ void block_job_event_completed(BlockJob *job, const char *msg)
 
 void block_job_event_ready(BlockJob *job)
 {
-    qapi_event_send_block_job_ready(bdrv_get_device_name(job->bs), &error_abort);
+    qapi_event_send_block_job_ready(job->driver->job_type,
+                                    bdrv_get_device_name(job->bs),
+                                    job->len,
+                                    job->offset,
+                                    job->speed, &error_abort);
 }
 
 BlockErrorAction block_job_error_action(BlockJob *job, BlockDriverState *bs,