Merge from TrustedBSD MAC branch:

    Move the network code from using cr_cansee() to check whether a
    socket is visible to a requesting credential to using a new
    function, cr_canseesocket(), which accepts a subject credential
    and object socket.  Implement cr_canseesocket() so that it does a
    prison check, a uid check, and add a comment where shortly a MAC
    hook will go.  This will allow MAC policies to seperately
    instrument the visibility of sockets from the visibility of
    processes.

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

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