To have service working nicely with procd it should be running in the
foreground. Otherwise it's not possible to e.g. stop it with the init.d
script. Luckily for us pptpd has a simple switch that allows it.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Fixes: 15e7f611af ("pptpd: convert init script to procd")

Add uci option mppe which makes the mppe parameter configurable;
the default value is required,no40,no56,stateless as before.

Add uci option logwtmp; when enabled updates wtmp when users
connect and disconnect

Signed-off-by: Hans Dedecker <dedeckeh@gmail.com>

Signed-off-by: Mislav Novakovic <mislav.novakovic@sartura.hr>

Signed-off-by: Luka Perkov <luka@openwrt.org>