Merge remote-tracking branch 'remotes/cody/tags/jtc-for-upstream-pull-request' into...

# gpg: Signature made Wed Jul 15 03:25:16 2015 BST using RSA key ID C0DE3057
# gpg: Good signature from "Jeffrey Cody <jcody@redhat.com>"
# gpg:                 aka "Jeffrey Cody <jeff@codyprime.org>"
# gpg:                 aka "Jeffrey Cody <codyprime@gmail.com>"
# gpg: WARNING: This key is not certified with sufficiently trusted signatures!
# gpg:          It is not certain that the signature belongs to the owner.
# Primary key fingerprint: 9957 4B4D 3474 90E7 9D98  D624 BDBE 7B27 C0DE 3057

* remotes/cody/tags/jtc-for-upstream-pull-request:
  block/curl: Don't lose original error when a connection fails.
  mirror: correct buf_size
  block: keep bitmap if incremental backup job is cancelled
  blockdev: no need to drain in qmp_block_commit
  block/mirror: Sleep periodically during bitmap scanning

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