TxKazoo client will keep trying to connect forever

When zookeeper servers are not reachable, otter gives up connecting after some 10 seconds or so. After that no group change / policy execution can work from that API node even if zookeeper nodes are come back up. Eventually, someone has to manually restart the server. This change will ensure kazoo keeps trying to connect forever. Please realize that this fixes only *startup* connection issue. If kazoo loses connection when otter is running, it may never recover when zk comes back.