[RFC] AFS: Implement OpenAFS pioctls(version)s

This series of patches provides a pioctl() system call, and makes kAFS use it
to provide a number of of the OpenAFS pioctl functions sufficient to allow a
number of OpenAFS userspace utilities work with kAFS.

File-requiring pioctls have been tested with:

	[root@andromeda ~]# fs getfid /afs
	File /afs (1.1.0) contained in volume 1
	[root@andromeda ~]# fs whichcell /afs
	File /afs lives in cell 'procyon.org.uk'
	[root@andromeda ~]# fs examine /afs
	fs: You don't have the required access rights on '/afs'
	[root@andromeda ~]# fs whereis /afs
	File /afs is on host altair.procyon.org.uk 

Non-file-requiring pioctls for manipulating authentication tokens have been
tested with:

	[root@andromeda ~]# kinit admin/admin
	Password for admin/admin@PROCYON.ORG.UK: 
	[root@andromeda ~]# klog admin
	Password:
	[root@andromeda ~]# keyctl show
	Session Keyring
	       -3 --alswrv      0     0  keyring: _ses
	939040040 --als--v      0     0   \_ rxrpc: afs@PROCYON.ORG.UK
	[root@andromeda ~]# fs examine /afs
	File /afs (1.1.32558) contained in volume 1
	Volume status for vid = 536870912 named 
	Current disk quota is 5000
	Current blocks used are 2
	The partition has 39007484 blocks available out of 39187776

	[root@andromeda ~]# aklog
	[root@andromeda ~]# keyctl show
	Session Keyring
	       -3 --alswrv      0     0  keyring: _ses
	660792724 --als--v      0     0   \_ rxrpc: afs@PROCYON.ORG.UK
	[root@andromeda ~]# tokens

	Tokens held by the Cache Manager:

	User's (AFS ID 10143) tokens for afs@PROCYON.ORG.UK [Expires Jun 17 00:47]
	   --End of list--

The AFS keys probably should be in their own keyring which is linked to from
the session keyring.
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