apparmor: pull in variables from tunables/global

The variables that were defined at the top of the apparmor profile are best
pulled in via the <tunables/global> include.

Docker-DCO-1.1-Signed-off-by: Michael Brown <michael.brown@discourse.org> (github: Supermathie)

libcontainer/apparmor/setup.go

@@ -11,13 +11,8 @@ import (
 const DefaultProfilePath = "/etc/apparmor.d/docker"
 const DefaultProfile = `
 # AppArmor profile from lxc for containers.
-@{HOME}=@{HOMEDIRS}/*/ /root/
-@{HOMEDIRS}=/home/
-#@{HOMEDIRS}+=
-@{multiarch}=*-linux-gnu*
-@{PROC}=/proc/
-@{pid}=self
 
+#include <tunables/global>
 profile docker-default flags=(attach_disconnected,mediate_deleted) {
   #include <abstractions/base>
   network,