keys & keyring management update patch

I've made available a patch that makes some alterations to my key management stuff, mainly to support keyfs. The patch can be downloaded from:

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

To summarise the changes in this patch:

(*) There are now five permissions instead of three, which makes things
easier. Hopefully it also means that people will stop thinking keys have UNIX access permissions, which they do not.

(*) The key "chmod" operation is now "setperm".

(*) fsuid/fsgid are now used instead of euid/egid when using permissions.

(*) Some stuff has been moved from the internal header file into
include/linux/key-ui.h to make it available to keyfs.

(*) /proc/keys is now disabled by default. It pretends keys don't exist
unless you have at least one permission on them.

David