Update AppArmor policy to by in sync with LXC

Specifically:
- reorganizes the rules to allow for easier comparison with other container
  policy
- adds comments for many rules
- adds bare dbus rule
- adds ptrace rule to allow ptracing ourselves
- adds deny mount options=(ro, remount, silent) -> /
- allows hugetlbfs
- adds cgmanager mount
- adds /sys/fs/pstore mount
- more specific /sys/kernel/security mount options
- more specific /sys mount options
- more specific /proc/sys/kernel/* deny rules
- more specific /proc/sys/net deny rules
- more specific /sys/class deny rules
- more specific /sys/devices deny rules
- more specific /sys/fs deny rules

Closes #8454

Signed-off-by: Jamie Strandboge <jamie@ubuntu.com>