Signed-off-by: Othmar Truniger <github@truniger.ch>

Previously, configuration of emailrelay was done by fiddling around
with the commandline inside the initscript. Introduce a config file
in /etc/config for basic configuration and at the same time switch
to a procd-style initscript.

Signed-off-by: Paul Wassi <p.wassi@gmx.at>