Dnscrypt-proxy needs some options to be set before it can do anything useful.
Currently, we only apply what the user configured which, by default, is nothing.
This leads to the dnscrypt-proxy2 service failing to start when you only set
`enable = true;` which is not a great user experience.
This patch makes the module take the example config from the upstream repo as a
base on top of which the user-specified settings are applied (it contains sane
defaults).
An option has been added to restore the old behaviour.
e4c49db668