add port to zk hosts; make default_servers a hash
add port to zk hosts; make default_servers a hash

johnmccabe/synapse,freiheit-com/synapse,StephanErb/synapse,lsjostro/synapse,democracyworks/synapse,bobtfish/synapse,bobtfish/synapse,hankya/synapse,tdooner/synapse,asiragusa/synapse,EasonYi/synapse,bcicen/synapse,gini/synapse,jolynch/synapse,Yelp/synapse,airbnb/synapse,dallasmarlow/synapse,claydotio/synapse,yonglehou/synapse-1