Revert "Decrease CPU utilization on recv thread"
Revert "Decrease CPU utilization on recv thread"

This reverts commit f3bbec4958ad0bc2da76bfb81856623f4732dcf3.
Going to save tackling this issue for v1.4.0.

KeelanArrendale/zmap,eacha/zmap,scarito/zmap,BobuSumisu/zmap,BobuSumisu/zmap,shakenetwork/zmap,willscott/zmap,cicku/zmap,potatozhao/zmap,unixfreaxjp/zmap,eacha/zmap,scarito/zmap-android,BobuSumisu/zmap,djeraseit/zmap,unixfreaxjp/zmap,unixfreaxjp/zmap,scarito/zmap,coolacid/zmap,djeraseit/zmap,zmap/zmap,KeelanArrendale/zmap,scarito/zmap,cicku/zmap,3L3N4/zmap,willscott/zmap,zhuyue1314/zmap,shakenetwork/zmap,willscott/zmap,willscott/zmap,djeraseit/zmap,zmap/zmap,eacha/zmap,willscott/zmap,coolacid/zmap,shakenetwork/zmap,tdi/zmap,eacha/zmap,shakenetwork/zmap,tdi/zmap,potatozhao/zmap,cicku/zmap,djeraseit/zmap,KeelanArrendale/zmap,scarito/zmap-android,KeelanArrendale/zmap,KeelanArrendale/zmap,3L3N4/zmap,coolacid/zmap,cicku/zmap,potatozhao/zmap,eacha/zmap,tdi/zmap,unixfreaxjp/zmap,zhuyue1314/zmap,BobuSumisu/zmap,shakenetwork/zmap,coolacid/zmap,tdi/zmap,3L3N4/zmap,BobuSumisu/zmap,scarito/zmap,potatozhao/zmap,scarito/zmap,coolacid/zmap,3L3N4/zmap,djeraseit/zmap,zmap/zmap,potatozhao/zmap,zhuyue1314/zmap,unixfreaxjp/zmap,zhuyue1314/zmap,tdi/zmap,scarito/zmap-android,zhuyue1314/zmap,cicku/zmap,scarito/zmap-android,3L3N4/zmap