Implement SO_NOSIGPIPE

The SO_NOSIGPIPE socket option allows a user process to mark a socket so
that the socket does not generate SIGPIPE, only EPIPE, when a write is
attempted after socket shutdown

Implement SO_NOSIGPIPE

The SO_NOSIGPIPE socket option allows a user process to mark a socket so
that the socket does not generate SIGPIPE, only EPIPE, when a write is
attempted after socket shutdown.

Regression test added: tools/regression/sockets/sigpipe

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