Define prototype for pru_close, which in the future will notify the protocol of a socket close event distinct from a detach event, which will (in a future commit) become aligned with pru_abort, which will also be a notification of close prior to detach.  Add prurequests event for close, as well as patch up some existing missing ones.
Define prototype for pru_close, which in the future will notify the
protocol of a socket close event distinct from a detach event, which
will (in a future commit) become aligned with pru_abort, which will
also be a notification of close prior to detach.  Add prurequests event
for close, as well as patch up some existing missing ones.

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