Merge remote-tracking branch 'remotes/stefanha/tags/qtest-for-peter' into staging

qtest resource cleanup patches

# gpg: Signature made Tue 04 Feb 2014 08:29:12 GMT using RSA key ID 81AB73C8
# gpg: Good signature from "Stefan Hajnoczi <stefanha@redhat.com>"
# gpg:                 aka "Stefan Hajnoczi <stefanha@gmail.com>"
# gpg: WARNING: This key is not certified with a trusted signature!
# gpg:          There is no indication that the signature belongs to the owner.
# Primary key fingerprint: 8695 A8BF D3F9 7CDA AC35  775A 9CA4 ABB3 81AB 73C8

* remotes/stefanha/tags/qtest-for-peter:
  qtest: unlink UNIX domain sockets after connecting
  qtest: unlink QEMU pid file after startup

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