remove unnecessary HostIterator classes
remove unnecessary HostIterator classes

Unreferenced outside of their own file and not providing any real value

tempbottle/kazoo,rackerlabs/kazoo,AlexanderplUs/kazoo,python-zk/kazoo,rackerlabs/kazoo,kormat/kazoo,jacksontj/kazoo,Asana/kazoo,kormat/kazoo,harlowja/kazoo,harlowja/kazoo,rockerbox/kazoo,rockerbox/kazoo,bsanders/kazoo,python-zk/kazoo,max0d41/kazoo,bsanders/kazoo,rgs1/kazoo,pombredanne/kazoo,pombredanne/kazoo,max0d41/kazoo,jacksontj/kazoo,rgs1/kazoo,AlexanderplUs/kazoo,tempbottle/kazoo