AFS: Add security support and fix bugs

These patches build on the patchset labelled "AF_RXRPC socket family and AFS
rewrite".  The patches are also available for http download.

Firstly, the patches fix a number of bugs in AF_RXRPC:

	http://people.redhat.com/~dhowells/rxrpc/09-af_rxrpc-own-...
	http://people.redhat.com/~dhowells/rxrpc/10-af_rxrpc-fixe...

Secondly, they fix some bugs in the AFS filesystem:

	http://people.redhat.com/~dhowells/rxrpc/11-afs-callback-...
	http://people.redhat.com/~dhowells/rxrpc/12-afs-vlocation...
	http://people.redhat.com/~dhowells/rxrpc/13-afs-multimoun...

And finally, they add security support to AFS:

	http://people.redhat.com/~dhowells/rxrpc/14-afs-rxrpc-key...
	http://people.redhat.com/~dhowells/rxrpc/15-afs-nameidata...
	http://people.redhat.com/~dhowells/rxrpc/16-afs-security....


A security key is acquired by running the klog program:

	http://people.redhat.com/~dhowells/rxrpc/klog.c

This is compiled by:

	make klog CFLAGS="-Wall -g" LDLIBS="-lcrypto -lcrypt -lkrb4 -lkeyutils"

And then run by:

	./klog

Note that at the moment this is a rough and ready test program that has the
username, realm, password and proposed key timeout compiled in.  Note also that
it will only talk to the AFS kaserver.


If a security key is acquired, then all subsequent operations - including VL
lookups and mounts - performed with that session keyring will be authenticated
using that key.  The key can be viewed like so:

	[root@andromeda ~]# keyctl show
	Session Keyring
	       -3 --alswrv      0     0  keyring: _ses.3268
		2 --alswrv      0     0   \_ keyring: _uid.0
	111416553 --als--v      0     0   \_ rxrpc: afs@CAMBRIDGE.REDHAT.COM

David
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