Merge remote-tracking branch 'quintela/migration.next' into staging

# By Chegu Vinod
# Via Juan Quintela
* quintela/migration.next:
  Force auto-convegence of live migration
  Add 'auto-converge' migration capability
  Introduce async_run_on_cpu()

Message-id: 1373664508-5404-1-git-send-email-quintela@redhat.com
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

diff --cc cpus.c
Simple merge

diff --cc migration.c
Simple merge

diff --cc qapi-schema.json
Simple merge