Security update for apparmor (important)

This update for apparmor fixes the following issues:

These security issues were fixed:

• CVE-2017-6507: Preserve unknown profiles when reloading apparmor.service
  (lp#1668892, boo#1029696)
• boo#1017260: Migration to apparmor.service accidently disable AppArmor.
  Note: This will re-enable AppArmor if it was disabled by the last
  update. You’ll need to "rcapparmor reload" to actually load the
  profiles, and then check aa-status for programs that need to be
  restarted to apply the profiles.

These non-security issues were fixed:

• Fixed crash in aa-logprof on specific change_hat events
• boo#1016259: Added var.mount dependeny to apparmor.service

The aa-remove-unknown utility was added to unload unknown profiles
(lp#1668892)