keys & keyring management: keyfs patch

I've made available a patch that creats a keyfs filesystem on top of my key management stuff. The patch can be downloaded from:

http://people.redhat.com/~dhowells/keys/keyfs-268rc4mm1.diff.bz2

For those who think a filesystem is the right interface for everything, despite it being ~18KB to the ~4KB required for a syscall interface, and _much_ less efficient generally in to the bargain.

David