Add methods for converting between stdlib and ad-hoc SockAddr
Add methods for converting between stdlib and ad-hoc SockAddr

As mio is concerned with few memory allocations, two versions of each function
are provided: consuming (no clone()) and using reference (with clone()).

yuikns/mio,polyfractal/mio,hjr3/mio,marjakm/mio,dpc/mio,zslayton/mio,frewsxcv/mio,danburkert/mio,dwrensha/mio,zhangf911/mio,alexcrichton/mio,mneumann/mio,zhangf911/mio,arthurprs/mio,fuchsia-mirror/third_party-mio,fuchsia-mirror/third_party-mio,jamwt/mio,fhartwig/mio,mneumann/mio,bottompawn/mio,tempbottle/mio,asomers/mio,jamwt/mio,rrichardson/mio,carllerche/mio,carllerche/mio,luca-barbieri/mio,greensnark/mio,geofft/mio,echochamber/mio,polyfractal/mio,yangxingpping/mio,pythonesque/mio,asomers/mio,mlalic/mio,tailhook/mio,rryan/mio,murarth/mio,thijsc/mio