Add sockbuf_pushsync(), an inline function that, following a change to

the head of the mbuf chains in a socket buffer, re-synchronizes the
cache pointers used to optimize socket buffer appends.  This will be
used by soreceive() before dropping socket buffer mutexes to make sure
a consistent version of the socket buffer is visible to other threads.

While here, update copyright to account for substantial rewrite of much
socket code required for fine-grained locking.

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