qemu: start all async job with job status active

qemu: start all async job with job status active

Setting status to none has little value - getting job status
will not return even elapsed time.

After this patch getting job stats stays correct in a sence
it will not fetch migration stats because it consults
stats.status before doing the fetch.

Signed-off-by: Jiri Denemark <jdenemar@redhat.com>