Add server christmas tree test

Add server christmas tree test

This sets as many server options as possible at once to detect
cut-and-paste bugs when implementing new server options in peer.c.
Most of the accessor functions are similar and it is easy to miss
updating a macro name or structure element name when adding new
accessor functions.

checkconf/setup.sh is there to minimise the difference to branches
with optional server options where the list is updated at runtime.