Do not emit logs on SIGPIPE since logging service could be unavailable

[maxvt]

This should fix #3554

[dadgar]

@maxvt Have you built and tried this change? If so it looks good! Want to confirm it fixes the problem first though!

[maxvt]

Haven't built it yet. I'm away from work for a few days, I'll try it (backported to the version we run) once I'm back.

[maxvt]

@dadgar I built and tested it, nothing seems to break but I couldn't reproduce the original problem we had either -- I could stop journald on the test box and Consul would freak out but Nomad stayed at low CPU. Up to you if you want to pick this up or close.

[dadgar]

Thanks for following up @maxvt!

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