Merge remote-tracking branch 'remotes/gkurz/tags/for-upstream' into staging

Just one trace

# gpg: Signature made Wed 02 May 2018 07:59:38 BST
# gpg:                using RSA key 71D4D5E5822F73D6
# gpg: Good signature from "Greg Kurz <groug@kaod.org>"
# gpg:                 aka "Gregory Kurz <gregory.kurz@free.fr>"
# gpg:                 aka "[jpeg image of size 3330]"
# Primary key fingerprint: B482 8BAF 9431 40CE F2A3  4910 71D4 D5E5 822F 73D6

* remotes/gkurz/tags/for-upstream:
  9p: add trace event for v9fs_setattr()

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