erts: Add undocumented option to do default SIGTERM
erts: Add undocumented option to do default SIGTERM

This is a stopgap measure before the release of OTP-20 where
that makes it possible for the user to make the vm not do
anything with SIGTERM and instead rely on the OS default.

To enable this behaviour the user should set the environment
variable ERL_ZZ_SIGTERM_KILL="true".

goertzenator/otp,vladdu/otp,bernardd/otp,aboroska/otp,dgud/otp,getong/otp,isvilen/otp,goertzenator/otp,vinoski/otp,falkevik/otp,getong/otp,fenollp/otp,tuncer/otp,RoadRunnr/otp,isvilen/otp,electricimp/otp,bernardd/otp,potatosalad/otp,mikpe/otp,cobusc/otp,lrascao/otp,ferd/otp,bjorng/otp,lrascao/otp,legoscia/otp,bernardd/otp,bernardd/otp,g-andrade/otp,potatosalad/otp,bjorng/otp,cobusc/otp,emacsmirror/erlang,tuncer/otp,cobusc/otp,rlipscombe/otp,electricimp/otp,kvakvs/otp,jj1bdx/otp,isvilen/otp,bsmr-erlang/otp,vladdu/otp,tuncer/otp,vinoski/otp,dumbbell/otp,goertzenator/otp,jj1bdx/otp,saleyn/otp,isvilen/otp,RoadRunnr/otp,bernardd/otp,RoadRunnr/otp,bjorng/otp,legoscia/otp,dgud/otp,ferd/otp,matwey/otp,lrascao/otp,bjorng/otp,ferd/otp,uabboli/otp,legoscia/otp,electricimp/otp,legoscia/otp,dumbbell/otp,vinoski/otp,erlang/otp,g-andrade/otp,vinoski/otp,matwey/otp,g-andrade/otp,kvakvs/otp,uabboli/otp,uabboli/otp,matwey/otp,falkevik/otp,bsmr-erlang/otp,electricimp/otp,uabboli/otp,goertzenator/otp,aboroska/otp,emacsmirror/erlang,saleyn/otp,erlang/otp,lrascao/otp,isvilen/otp,vinoski/otp,getong/otp,aboroska/otp,saleyn/otp,rlipscombe/otp,vladdu/otp,vladdu/otp,uabboli/otp,lrascao/otp,erlang/otp,getong/otp,bsmr-erlang/otp,potatosalad/otp,vladdu/otp,RoadRunnr/otp,RaimoNiskanen/otp,legoscia/otp,goertzenator/otp,dumbbell/otp,jj1bdx/otp,mikpe/otp,RaimoNiskanen/otp,dumbbell/otp,potatosalad/otp,g-andrade/otp,saleyn/otp,jj1bdx/otp,saleyn/otp,ferd/otp,cobusc/otp,erlang/otp,erlang/otp,aboroska/otp,cobusc/otp,kvakvs/otp,RoadRunnr/otp,bsmr-erlang/otp,bsmr-erlang/otp,aboroska/otp,electricimp/otp,g-andrade/otp,dgud/otp,potatosalad/otp,jj1bdx/otp,bjorng/otp,electricimp/otp,matwey/otp,vinoski/otp,jj1bdx/otp,emacsmirror/erlang,vladdu/otp,legoscia/otp,legoscia/otp,getong/otp,mikpe/otp,emacsmirror/erlang,g-andrade/otp,mikpe/otp,isvilen/otp,jj1bdx/otp,rlipscombe/otp,mikpe/otp,ferd/otp,dgud/otp,vinoski/otp,fenollp/otp,dumbbell/otp,potatosalad/otp,uabboli/otp,jj1bdx/otp,emacsmirror/erlang,potatosalad/otp,RaimoNiskanen/otp,legoscia/otp,cobusc/otp,potatosalad/otp,fenollp/otp,bsmr-erlang/otp,dgud/otp,kvakvs/otp,isvilen/otp,mikpe/otp,bernardd/otp,RaimoNiskanen/otp,erlang/otp,RoadRunnr/otp,rlipscombe/otp,potatosalad/otp,bjorng/otp,electricimp/otp,vladdu/otp,RaimoNiskanen/otp,bjorng/otp,RoadRunnr/otp,tuncer/otp,tuncer/otp,saleyn/otp,legoscia/otp,bjorng/otp,falkevik/otp,cobusc/otp,bernardd/otp,lrascao/otp,isvilen/otp,RaimoNiskanen/otp,ferd/otp,lrascao/otp,RaimoNiskanen/otp,goertzenator/otp,fenollp/otp,potatosalad/otp,tuncer/otp,rlipscombe/otp,RaimoNiskanen/otp,g-andrade/otp,rlipscombe/otp,rlipscombe/otp,bernardd/otp,rlipscombe/otp,uabboli/otp,vinoski/otp,RoadRunnr/otp,fenollp/otp,mikpe/otp,falkevik/otp,mikpe/otp,emacsmirror/erlang,vladdu/otp,falkevik/otp,matwey/otp,matwey/otp,bsmr-erlang/otp,bsmr-erlang/otp,jj1bdx/otp,emacsmirror/erlang,dumbbell/otp,ferd/otp,saleyn/otp,dgud/otp,cobusc/otp,matwey/otp,matwey/otp,aboroska/otp,isvilen/otp,bjorng/otp,fenollp/otp,mikpe/otp,dumbbell/otp,erlang/otp,aboroska/otp,bernardd/otp,emacsmirror/erlang,aboroska/otp,isvilen/otp,dgud/otp,bsmr-erlang/otp,fenollp/otp,kvakvs/otp,kvakvs/otp,vinoski/otp,uabboli/otp,matwey/otp,vinoski/otp,lrascao/otp,tuncer/otp,goertzenator/otp,bjorng/otp,g-andrade/otp,getong/otp,ferd/otp,mikpe/otp,erlang/otp,getong/otp,kvakvs/otp,rlipscombe/otp,fenollp/otp,falkevik/otp,emacsmirror/erlang,falkevik/otp,getong/otp,goertzenator/otp,erlang/otp,dumbbell/otp,saleyn/otp,emacsmirror/erlang,dgud/otp,aboroska/otp,dumbbell/otp,RoadRunnr/otp,jj1bdx/otp,fenollp/otp,getong/otp,falkevik/otp,g-andrade/otp,dumbbell/otp,g-andrade/otp,erlang/otp,saleyn/otp,uabboli/otp,dgud/otp,kvakvs/otp,goertzenator/otp,ferd/otp,rlipscombe/otp,electricimp/otp,electricimp/otp,getong/otp,tuncer/otp,kvakvs/otp,lrascao/otp,tuncer/otp,vladdu/otp,falkevik/otp,RaimoNiskanen/otp,dgud/otp