Merge remote-tracking branch 'remotes/juanquintela/tags/migration/20140616' into...

migration/next for 20140616

# gpg: Signature made Mon 16 Jun 2014 04:10:18 BST using RSA key ID 5872D723
# gpg: Can't check signature: public key not found

* remotes/juanquintela/tags/migration/20140616:
  migration: catch unknown flags in ram_load
  rdma: Fix block during rdma migration
  migration: Increase default max_downtime from 30ms to 300ms
  vmstate: Refactor opening of files
  savevm: Remove all the unneeded version_minimum_id_old (x86)
  savevm: Remove all the unneeded version_minimum_id_old (ppc)

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>