[esock|test] Some platforms does not accept acceptconn for UDP
[esock|test] Some platforms does not accept acceptconn for UDP

Some platforms (for example darwin and OpenBSD) does not accept
this option for UDP. Will result in 'enoprotoopt'. So, skip
that part of the test case (UDP) if this error occurs.

OTP-15904

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