refactor crawler thread a bit
refactor crawler thread a bit

reduce indentation, shorten the function a bit. also now sleeps after every
inspected item vs after each run through all active slabs.

xiaosl/memcached,surajdharmapuram/memcached,13693100472/memcached,amyvmiwei/memcached,allen8807/memcached-1,myPublicGit/memcached,dianerdianer/memcached,elfchief/memcached,leedc/memcached,samt42/memcached,samanbarghi/memcached,guikcd/memcached,fengshao0907/memcached,samt42/memcached,cloudrain21/memcached,niaomingjian/memcached,rhli/memcached,alexandermerritt/memcached,xiaosl/memcached,ClearwaterCore/memcached,xiaosl/memcached,bpzhang/memcached,williamcheungthu/memcached,guikcd/memcached,neutronsharc/memcached,emcconville/memcached,rmccullagh/memcached,williamcheungthu/memcached,xiaosl/memcached,romanticode/memcached,surajdharmapuram/memcached,angusfenying/memcached-win64,msg7086/repcached,dormando/memcached,angusfenying/memcached-win64,Danzeer/memcached,romanticode/memcached,dianerdianer/memcached,memcached/memcached,neutronsharc/memcached,EdwardLee03/memcached,guikcd/memcached,niaomingjian/memcached,ZhangZhenhua/memcached,neutronsharc/memcached,EdwardLee03/memcached,ClearwaterCore/memcached,13693100472/memcached,allen8807/memcached-1,romanticode/memcached,mitliucak/memcached,neutronsharc/memcached,Dhruva6/memcached,fengshao0907/memcached,Danzeer/memcached,elfchief/memcached,Danzeer/memcached,allen8807/memcached-1,cloudrain21/memcached,surajdharmapuram/memcached,amyvmiwei/memcached,amyvmiwei/memcached,Dhruva6/memcached,gencer/memcached,EdwardLee03/memcached,ZhangZhenhua/memcached,bpzhang/memcached,rhli/memcached,13693100472/memcached,williamcheungthu/memcached,tmharrisonwang/memcached,ClearwaterCore/memcached,emcconville/memcached,elfchief/memcached,kamyu104/memcached,myPublicGit/memcached,memcached/memcached,jeremiahyan/memcached,mitliucak/memcached,memcached/memcached,ClearwaterCore/memcached,ZhangZhenhua/memcached,cloudrain21/memcached,ZhangZhenhua/memcached,msg7086/repcached,memcached/memcached,msg7086/repcached,niaomingjian/memcached,jeremiahyan/memcached,mitliucak/memcached,angusfenying/memcached-win64,dormando/memcached,DSrcl/memcached,DSrcl/memcached,myPublicGit/memcached,EdwardLee03/memcached,Dhruva6/memcached,bpzhang/memcached,tmharrisonwang/memcached,emcconville/memcached,alexandermerritt/memcached,leedc/memcached,bpzhang/memcached,dormando/memcached,cloudrain21/memcached,Dhruva6/memcached,rmccullagh/memcached,msg7086/repcached,alexandermerritt/memcached,kamyu104/memcached,DSrcl/memcached,Danzeer/memcached,romanticode/memcached,guikcd/memcached,elfchief/memcached,samt42/memcached,dianerdianer/memcached,jeremiahyan/memcached,elfchief/memcached,kamyu104/memcached,samanbarghi/memcached,samanbarghi/memcached,myPublicGit/memcached,rmccullagh/memcached,tmharrisonwang/memcached,gencer/memcached,allen8807/memcached-1,dormando/memcached,memcached/memcached,guikcd/memcached,rmccullagh/memcached,rhli/memcached,leedc/memcached,kamyu104/memcached,samt42/memcached,gencer/memcached,amyvmiwei/memcached,emcconville/memcached,mitliucak/memcached,fengshao0907/memcached,jeremiahyan/memcached,surajdharmapuram/memcached,niaomingjian/memcached,alexandermerritt/memcached,DSrcl/memcached,msg7086/repcached,williamcheungthu/memcached,dianerdianer/memcached,fengshao0907/memcached,dormando/memcached,leedc/memcached,13693100472/memcached,rhli/memcached,gencer/memcached,angusfenying/memcached-win64,samanbarghi/memcached,13693100472/memcached,rmccullagh/memcached,gencer/memcached,tmharrisonwang/memcached