nixos: add config.services.openssh.moduliFile option so that users can replace the default file from OpenSSH

The man page for ssh-keygen(1) has a section "MODULI GENERATION" that describes
how to generate your own moduli file. The following script might also be helpful:

 | #! /usr/bin/env bash
 |
 | moduliFiles=()
 |
 | generateModuli()
 | {
 |   ssh-keygen -G "moduli-$1.candidates" -b "$1"
 |   ssh-keygen -T "moduli-$1" -f "moduli-$1.candidates"
 |   rm "moduli-$1.candidates"
 | }
 |
 | for (( i=0 ; i <= 16 ; ++i )); do
 |   let bitSize="2048 + i * 128"
 |   generateModuli "$bitSize" &
 |   moduliFiles+=( "moduli-$bitSize" )
 | done
 | wait
 |
 | echo >moduli "# Time Type Tests Tries Size Generator Modulus"
 | cat >>moduli "${moduliFiles[@]}"
 | rm "${moduliFiles[@]}"

Note that generating moduli takes a long time, i.e. several hours on a fast
machine!

This patch resolves https://github.com/NixOS/nixpkgs/pull/5870.

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