Merge remote-tracking branch 'remotes/dgilbert/tags/pull-migration-20180710a' into...

Merge remote-tracking branch 'remotes/dgilbert/tags/pull-migration-20180710a' into staging

Migration pull 2018-07-10 (for 3.0)

Migration fixes and migration test fixes, mostly
around postcopy and postcopy recovery

# gpg: Signature made Tue 10 Jul 2018 16:27:19 BST
# gpg:                using RSA key 0516331EBC5BFDE7
# gpg: Good signature from "Dr. David Alan Gilbert (RH2) <dgilbert@redhat.com>"
# Primary key fingerprint: 45F5 C71B 4A0C B7FB 977A  9FA9 0516 331E BC5B FDE7

* remotes/dgilbert/tags/pull-migration-20180710a:
  migration: reorder MIG_CMD_POSTCOPY_RESUME
  tests: hide stderr for postcopy recovery test
  tests: add postcopy recovery test
  tests: introduce wait_for_migration_status()
  tests: introduce migrate_query*() helpers
  tests: allow migrate() to take extra flags
  tests: introduce migrate_postcopy_* helpers
  migration: show pause/recover state on dst host
  migration: fix incorrect bitmap size calculation
  migration: loosen recovery check when load vm
  migration: simplify check to use qemu file buffer
  migration: unify incoming processing
  migration: unbreak postcopy recovery
  migration: move income process out of multifd
  migration: delay postcopy paused state

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