Use ppp-mod-pppoe instead of shipping its own broken plugin
Always use rp-pppoe.so instead of the (not packaged) pppoe user space
implementation

Signed-off-by: Felix Fietkau <nbd@nbd.name>

Remove misspelled configuration options which were left in place
for reasons of backwards-compatibility.

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

Due to a typo in the init scripts, certain parameters are not appended
to the cmdline. (max. # of concurrent sessions).
For backwards compatibility leave both spellings in place.

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

Add back from oldpackages with fixes for build errors and UCIfication
(for LuCI app submitted in a related PR (against LuCI repo)).

NOTE: Untested packages have been marked with @BROKEN.  This can
be undone of others report success with the sniffer

Signed-off-by: Daniel Dickinson <lede@daniel.thecshore.com>