Change send_run to better handle small rates.
Change send_run to better handle small rates.

Use nanosleep to sleep instead of having a busy loop which just consumes
too much CPU for slow scans (like 2 packets per second).

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