More threaded handler tests.
More threaded handler tests.

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