[esock|test] Add plain send/recv medium ping-pong test case for local
[esock|test] Add plain send/recv medium ping-pong test case for local

Add a (plain) send and recv medium ping-pong test case for
Unix Domain (stream) socket.

OTP-15822

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