pppoe-server: T2313: bugfix Floating Point Exception
pppoe-server: T2313: bugfix Floating Point Exception

When only defining a timeout limit the generated config will look like:
  [connlimit]
  limit=
  burst=
  timeout=5

This will trigger a "Floating point exception" on startup of Accel-PPP and it
can be re-surrected anymore until service is completely deleted and re-added.

vyos/vyos-1x,vyos/vyos-1x,vyos/vyos-1x,vyos/vyos-1x