hone: store uid and loginuid with processes.

loginuid, aka auid or audit uid, is the immutable id of a user when they first log in.
It doesn't change eg. across invocations of su or sudo.
hone: use jprobe to notify on socket destruction.

Overwriting sk_destruct (and incrementing the module refcount) means that the module
can't be unloaded until any long-lived network connections are terminated. In practice,
this means that if you load the module and then restart sshd, you can't unload the
hone modules until you kill sshd.