Actually exclude hosts when merging host lists.
Actually exclude hosts when merging host lists.

Re #373

sdelements/fabric,MjAbuz/fabric,rodrigc/fabric,mathiasertl/fabric,bitprophet/fabric,tolbkni/fabric,raimon49/fabric,pashinin/fabric,askulkarni2/fabric,haridsv/fabric,StackStorm/fabric,cmattoon/fabric,likesxuqiang/fabric,bspink/fabric,jaraco/fabric,SamuelMarks/fabric,ploxiln/fabric,akaariai/fabric,fernandezcuesta/fabric,getsentry/fabric,tekapo/fabric,pgroudas/fabric,xLegoz/fabric,bitmonk/fabric,TarasRudnyk/fabric,cgvarela/fabric,itoed/fabric,qinrong/fabric,hrubi/fabric,amaniak/fabric,kmonsoor/fabric,opavader/fabric,rbramwell/fabric,rane-hs/fabric-py3,elijah513/fabric,felix-d/fabric,kxxoling/fabric