[snmp|manager] Use of inet-backend for gen_udp
[snmp|manager] Use of inet-backend for gen_udp

Make it possible to configure manager transport (net-if) to
use the inet_backend gen_udp option.

OTP-17526

g-andrade/otp,emacsmirror/erlang,g-andrade/otp,g-andrade/otp,dgud/otp,isvilen/otp,getong/otp,vinoski/otp,dumbbell/otp,dumbbell/otp,getong/otp,jj1bdx/otp,erlang/otp,jj1bdx/otp,dgud/otp,mikpe/otp,emacsmirror/erlang,rlipscombe/otp,isvilen/otp,isvilen/otp,rlipscombe/otp,getong/otp,erlang/otp,bjorng/otp,mikpe/otp,rlipscombe/otp,erlang/otp,ferd/otp,potatosalad/otp,emacsmirror/erlang,bjorng/otp,emacsmirror/erlang,ferd/otp,erlang/otp,g-andrade/otp,jj1bdx/otp,vinoski/otp,potatosalad/otp,erlang/otp,mikpe/otp,erlang/otp,bjorng/otp,rlipscombe/otp,getong/otp,isvilen/otp,isvilen/otp,mikpe/otp,rlipscombe/otp,mikpe/otp,ferd/otp,emacsmirror/erlang,dumbbell/otp,potatosalad/otp,potatosalad/otp,vinoski/otp,dumbbell/otp,g-andrade/otp,getong/otp,isvilen/otp,emacsmirror/erlang,potatosalad/otp,vinoski/otp,bjorng/otp,potatosalad/otp,jj1bdx/otp,ferd/otp,bjorng/otp,emacsmirror/erlang,mikpe/otp,isvilen/otp,erlang/otp,bjorng/otp,mikpe/otp,emacsmirror/erlang,jj1bdx/otp,potatosalad/otp,vinoski/otp,potatosalad/otp,rlipscombe/otp,bjorng/otp,erlang/otp,dumbbell/otp,isvilen/otp,dumbbell/otp,mikpe/otp,rlipscombe/otp,emacsmirror/erlang,ferd/otp,bjorng/otp,emacsmirror/erlang,potatosalad/otp,g-andrade/otp,vinoski/otp,vinoski/otp,vinoski/otp,jj1bdx/otp,getong/otp,dgud/otp,dgud/otp,rlipscombe/otp,bjorng/otp,dgud/otp,isvilen/otp,ferd/otp,dgud/otp,erlang/otp,getong/otp,mikpe/otp,potatosalad/otp,vinoski/otp,dgud/otp,dumbbell/otp,jj1bdx/otp,dumbbell/otp,getong/otp,erlang/otp,jj1bdx/otp,rlipscombe/otp,getong/otp,mikpe/otp,g-andrade/otp,dgud/otp,dgud/otp,jj1bdx/otp,ferd/otp,vinoski/otp,bjorng/otp,dumbbell/otp,dumbbell/otp,getong/otp,ferd/otp,g-andrade/otp,jj1bdx/otp,rlipscombe/otp,g-andrade/otp,ferd/otp,dgud/otp,g-andrade/otp,isvilen/otp