[esock|test] Add (traffic) counter (udp) test cases
[esock|test] Add (traffic) counter (udp) test cases

Add two simple (traffic) counter test cases, to test counter
actions for normal traffic (send and receive using sendmsg
and recvmsg).
One for IPv4 udp and one for unix-domain-socket stream (udp).

OTP-15818

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