[apparmor] Making AppArmor work with new mount API

[David Howells]

Hi,

I could do with some help in making AppArmor work with the new mount API:

	https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git/log/?h=mount-context

For starters, all the security mount hooks have changed to take a context
parameter.  The options are parsed individually rather than being one big
chunk of data, there's mountpoint/superblock flag split and superblock
creation is made distinct from mountpoint creation.

David