gateway: work around kernel IPIP module initialisation bug
gateway: work around kernel IPIP module initialisation bug

First reported by Daniel.
I've reworked his approach to retry deeper in the call chain
in order to deal with the problem where it actually occurs.

Reported-by: Daniel <3d0f3b9ddcacec30c4008c5e030e6c13a478cb4f@makrotopia.org>
Signed-off-by: Ferry Huberts <66e11f9f5d965b69497c7e73d5e808f8b13c1218@pelagic.nl>

cholin/olsrd,ninuxorg/olsrd,sebkur/olsrd,tdz/olsrd,diogomg/olsrd-binary-heap,cholin/olsrd,tdz/olsrd,zioproto/olsrd,zioproto/olsrd,sebkur/olsrd,diogomg/olsrd-binary-heap,nolith/olsrd,ninuxorg/olsrd,diogomg/olsrd-binary-heap,nolith/olsrd,tdz/olsrd,sebkur/olsrd,cholin/olsrd,sebkur/olsrd,sebkur/olsrd,tdz/olsrd,diogomg/olsrd,diogomg/olsrd,nolith/olsrd,diogomg/olsrd,diogomg/olsrd-binary-heap,zioproto/olsrd,diogomg/olsrd-binary-heap,diogomg/olsrd,ninuxorg/olsrd,nolith/olsrd,zioproto/olsrd,diogomg/olsrd-binary-heap,ninuxorg/olsrd,tdz/olsrd,diogomg/olsrd,zioproto/olsrd,cholin/olsrd,sebkur/olsrd,ninuxorg/olsrd,diogomg/olsrd,diogomg/olsrd-binary-heap,cholin/olsrd,diogomg/olsrd,nolith/olsrd