NTS: config and initialization

[Hal Murray]

> Here's a proposal off the top of my head:
> 1) server private key = SYSCONFDIR/ntp/nts.key
> 2) server certificate = SYSCONFDIR/ntp/nts.crt
> 3) cookie key file    = LOCALSTATEDIR/lib/ntpkeys

We would have to add things  like SYSCONFDIR to config.h.

The certificate and private key should probably have a pem suffix and/or maybe 
I need to add code to support other formats.


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