Merge remote-tracking branch 'remotes/otubo/tags/pull-seccomp-20170915' into staging

pull-seccomp-20170915

# gpg: Signature made Fri 15 Sep 2017 09:21:15 BST
# gpg:                using RSA key 0xDF32E7C0F0FFF9A2
# gpg: Good signature from "Eduardo Otubo (Senior Software Engineer) <otubo@redhat.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: D67E 1B50 9374 86B4 0723  DBAB DF32 E7C0 F0FF F9A2

* remotes/otubo/tags/pull-seccomp-20170915:
  buildsys: Move seccomp cflags/libs to per object
  seccomp: add resourcecontrol argument to command line
  seccomp: add spawn argument to command line
  seccomp: add elevateprivileges argument to command line
  seccomp: add obsolete argument to command line
  seccomp: changing from whitelist to blacklist

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