Merge remote-tracking branch 'remotes/dgilbert/tags/pull-hmp-20180925' into staging

Merge remote-tracking branch 'remotes/dgilbert/tags/pull-hmp-20180925' into staging

HMP pull 2018-09-25

# gpg: Signature made Tue 25 Sep 2018 15:11:09 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-hmp-20180925:
  qmp, hmp: add PCI subsystem id and vendor id to PCI info
  hmp: fix migrate status timer leak
  monitor: print message when using 'help' with an unknown command

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