[esock|test] Add test case(s) for the [rcv|snd]buf socket option (UDP)
[esock|test] Add test case(s) for the [rcv|snd]buf socket option (UDP)

Add simple testcase(s) for the rcvbuf and sndbuf socket option(s) (UDP).

OTP-16114

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