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

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

Most notable change in this PR is the full removal of the "handle" fsdev
backend.

# gpg: Signature made Wed 12 Dec 2018 13:20:42 GMT
# 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: remove support for the "handle" backend
  xen/9pfs: use g_new(T, n) instead of g_malloc(sizeof(T) * n)
  9p: use g_new(T, n) instead of g_malloc(sizeof(T) * n)

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