[socket-nif] Improve socket stop
[socket-nif] Improve socket stop

Make sure the current whatever (writer, reader or writer) is
not the closer pid before *attempting* to sending the abort message.
And if that fails, issue a warning message (not aborting).

OTP-14831

isvilen/otp,mikpe/otp,uabboli/otp,electricimp/otp,kvakvs/otp,erlang/otp,legoscia/otp,ferd/otp,legoscia/otp,potatosalad/otp,potatosalad/otp,uabboli/otp,uabboli/otp,rlipscombe/otp,emacsmirror/erlang,g-andrade/otp,kvakvs/otp,getong/otp,isvilen/otp,vinoski/otp,potatosalad/otp,aboroska/otp,bsmr-erlang/otp,g-andrade/otp,uabboli/otp,g-andrade/otp,bsmr-erlang/otp,getong/otp,aboroska/otp,emacsmirror/erlang,bjorng/otp,electricimp/otp,isvilen/otp,kvakvs/otp,mikpe/otp,vladdu/otp,ferd/otp,ferd/otp,lrascao/otp,erlang/otp,dumbbell/otp,erlang/otp,mikpe/otp,RoadRunnr/otp,vladdu/otp,legoscia/otp,isvilen/otp,vinoski/otp,vinoski/otp,uabboli/otp,rlipscombe/otp,lrascao/otp,dgud/otp,bjorng/otp,RoadRunnr/otp,mikpe/otp,emacsmirror/erlang,vladdu/otp,dumbbell/otp,potatosalad/otp,vinoski/otp,legoscia/otp,aboroska/otp,g-andrade/otp,emacsmirror/erlang,mikpe/otp,aboroska/otp,aboroska/otp,RoadRunnr/otp,dumbbell/otp,isvilen/otp,erlang/otp,dumbbell/otp,g-andrade/otp,erlang/otp,RoadRunnr/otp,emacsmirror/erlang,RoadRunnr/otp,legoscia/otp,dumbbell/otp,dgud/otp,dumbbell/otp,bjorng/otp,bjorng/otp,aboroska/otp,vladdu/otp,dgud/otp,ferd/otp,getong/otp,mikpe/otp,jj1bdx/otp,erlang/otp,legoscia/otp,electricimp/otp,electricimp/otp,lrascao/otp,ferd/otp,potatosalad/otp,jj1bdx/otp,rlipscombe/otp,dgud/otp,emacsmirror/erlang,jj1bdx/otp,potatosalad/otp,vladdu/otp,emacsmirror/erlang,bsmr-erlang/otp,lrascao/otp,vinoski/otp,vinoski/otp,isvilen/otp,g-andrade/otp,ferd/otp,jj1bdx/otp,isvilen/otp,aboroska/otp,bsmr-erlang/otp,electricimp/otp,g-andrade/otp,potatosalad/otp,jj1bdx/otp,uabboli/otp,uabboli/otp,legoscia/otp,jj1bdx/otp,bsmr-erlang/otp,bsmr-erlang/otp,rlipscombe/otp,lrascao/otp,getong/otp,bjorng/otp,getong/otp,dgud/otp,g-andrade/otp,rlipscombe/otp,dgud/otp,kvakvs/otp,erlang/otp,vinoski/otp,kvakvs/otp,vladdu/otp,rlipscombe/otp,jj1bdx/otp,kvakvs/otp,dumbbell/otp,uabboli/otp,potatosalad/otp,g-andrade/otp,isvilen/otp,legoscia/otp,bjorng/otp,electricimp/otp,getong/otp,potatosalad/otp,aboroska/otp,erlang/otp,isvilen/otp,vladdu/otp,legoscia/otp,rlipscombe/otp,dumbbell/otp,rlipscombe/otp,dgud/otp,lrascao/otp,jj1bdx/otp,ferd/otp,kvakvs/otp,RoadRunnr/otp,RoadRunnr/otp,electricimp/otp,dgud/otp,electricimp/otp,bsmr-erlang/otp,vinoski/otp,jj1bdx/otp,emacsmirror/erlang,uabboli/otp,RoadRunnr/otp,vladdu/otp,erlang/otp,jj1bdx/otp,bsmr-erlang/otp,dgud/otp,RoadRunnr/otp,getong/otp,ferd/otp,getong/otp,aboroska/otp,rlipscombe/otp,mikpe/otp,emacsmirror/erlang,lrascao/otp,getong/otp,vinoski/otp,isvilen/otp,ferd/otp,bjorng/otp,vinoski/otp,vladdu/otp,bsmr-erlang/otp,kvakvs/otp,rlipscombe/otp,mikpe/otp,lrascao/otp,dgud/otp,getong/otp,g-andrade/otp,lrascao/otp,bjorng/otp,electricimp/otp,bjorng/otp,mikpe/otp,kvakvs/otp,dumbbell/otp,erlang/otp,mikpe/otp,dumbbell/otp,potatosalad/otp,emacsmirror/erlang,bjorng/otp