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>

- moved from net to mail category
- removed no-ssl package and added ssl support as configuration option (default enabled)
- added configuration option to support extended logging (default disabled)
- disabled build of test tools
- added LEDE compatibility (support for openssl without SSL3)

Signed-off-by: Federico Di Marco <fededim@gmail.com>

Signed-off-by: Charles Lehner <cel@celehner.com>