Introduce support for Mandatory Access Control and extensible kernel

access control.

Label socket IPC objects, permitting security features to be maintained
at the granularity of the socket.  Two labels are stored for each
socket: the label of the socket itself, and a cached peer label
permitting interogation of the remote endpoint.  Since socket locking
is not yet present in the base tree, these objects are not locked,
but are assumed to follow the same semantics as other modifiable
entries in the socket structure.

Obtained from:	TrustedBSD Project
Sponsored by:	DARPA, NAI Labs

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