Merge remote-tracking branch 'remotes/dgilbert-gitlab/tags/pull-migration-20210713a...

Merge remote-tracking branch 'remotes/dgilbert-gitlab/tags/pull-migration-20210713a' into staging

Migration pull 2021-07-13

# gpg: Signature made Tue 13 Jul 2021 16:22:28 BST
# gpg:                using RSA key 45F5C71B4A0CB7FB977A9FA90516331EBC5BFDE7
# gpg: Good signature from "Dr. David Alan Gilbert (RH2) <[email protected]>" [full]
# Primary key fingerprint: 45F5 C71B 4A0C B7FB 977A  9FA9 0516 331E BC5B FDE7

* remotes/dgilbert-gitlab/tags/pull-migration-20210713a:
  migration: Move bitmap_mutex out of migration_bitmap_clear_dirty()
  migration: Clear error at entry of migrate_fd_connect()
  migration: Don't do migrate cleanup if during postcopy resume
  migration: Release return path early for paused postcopy
  migration: failover: emit a warning when the card is not fully unplugged
  migration/rdma: prevent from double free the same mr

Signed-off-by: Peter Maydell <[email protected]>