pkg/rpcplus/fdrpc: Add ClosingFD type that closes after sending
pkg/rpcplus/fdrpc: Add ClosingFD type that closes after sending

Signed-off-by: Jonathan Rudenberg <3692bfa45759a67d83aedf0045f6cb635a966abf@titanous.com>

josephglanville/flynn,Brandywine2161/flynn,TribeMedia/flynn,shutej/flynn,felixrieseberg/flynn,TribeMedia/flynn,jzila/flynn,flynn/flynn,GrimDerp/flynn,flynn/flynn,clifff/flynn,TribeMedia/flynn,flynn/flynn,felixrieseberg/flynn,kgrz/flynn,technosophos/flynn,pkdevbox/flynn,Brandywine2161/flynn,justintung/flynn,tonicbupt/flynn,pkdevbox/flynn,whouses/flynn,josephglanville/flynn,felixrieseberg/flynn,whouses/flynn,rikur/flynn,schatt/flynn,mubassirhayat/flynn,justintung/flynn,justintung/flynn,GrimDerp/flynn,tonicbupt/flynn,technosophos/flynn,josephglanville/flynn,lmars/flynn,ozum/flynn,ozum/flynn,ozum/flynn,Brandywine2161/flynn,jzila/flynn,technosophos/flynn,rikur/flynn,kgrz/flynn,shads196770/flynn,supermario/flynn,benbjohnson/flynn,felixrieseberg/flynn,arekkas/flynn,benbjohnson/flynn,arekkas/flynn,shads196770/flynn,GrimDerp/flynn,schatt/flynn,supermario/flynn,jzila/flynn,supermario/flynn,arekkas/flynn,GrimDerp/flynn,benbjohnson/flynn,lmars/flynn,philiplb/flynn,benbjohnson/flynn,GrimDerp/flynn,pkdevbox/flynn,shads196770/flynn,clifff/flynn,mubassirhayat/flynn,rikur/flynn,clifff/flynn,shads196770/flynn,arekkas/flynn,technosophos/flynn,jzila/flynn,whouses/flynn,pkdevbox/flynn,schatt/flynn,kgrz/flynn,rikur/flynn,clifff/flynn,flynn/flynn,ozum/flynn,philiplb/flynn,felixrieseberg/flynn,josephglanville/flynn,jzila/flynn,ozum/flynn,philiplb/flynn,supermario/flynn,jzila/flynn,mubassirhayat/flynn,josephglanville/flynn,justintung/flynn,kgrz/flynn,whouses/flynn,TribeMedia/flynn,mubassirhayat/flynn,TribeMedia/flynn,Brandywine2161/flynn,rikur/flynn,philiplb/flynn,Brandywine2161/flynn,tonicbupt/flynn,tonicbupt/flynn,GrimDerp/flynn,tonicbupt/flynn,lmars/flynn,pkdevbox/flynn,arekkas/flynn,supermario/flynn,supermario/flynn,schatt/flynn,shads196770/flynn,benbjohnson/flynn,clifff/flynn,philiplb/flynn,Brandywine2161/flynn,ozum/flynn,schatt/flynn,kgrz/flynn,clifff/flynn,flynn/flynn,justintung/flynn,rikur/flynn,pkdevbox/flynn,lmars/flynn,kgrz/flynn,benbjohnson/flynn,shads196770/flynn,josephglanville/flynn,technosophos/flynn,whouses/flynn,schatt/flynn,lmars/flynn,whouses/flynn,justintung/flynn,TribeMedia/flynn