[pkg-apparmor] Bug#879585: apparmor: Pin the AppArmor feature set in Stretch to Linux 4.9's

[intrigeri]

Hi,

for the record I think the next steps are:

1. ensure the blocking kernel bug is fixed:
   https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=883703#32

2. adjust the Stretch packaging branch so it uses the same
   implementation as testing/sid (#879585)

3. update the stretch-pu request (#882697)

Cheers,
-- 
intrigeri