SIGPIPE handling in nnrpd

[Heath Kehoe]

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Ok, so the nnrpd has a SIGPIPE handler which calls ExitWithStats.
This is Bad.  Specially for ovdb.  So I propose that instead of
setting a SIGPIPE handler, we set SIGPIPE to SIG_IGN.  This should
cause a write to return EPIPE instead; which will be caught
in-line and allowing a proper exit.

Unless there are any objections, I'd like to put this change in
both STABLE and CURRENT.

- - heath
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