Looks pretty serious - quorum is formed but no clients can attach. Will attach logs momentarily.
This test was introduced in the following commit (all three jira commit at once):
ZOOKEEPER-335. zookeeper servers should commit the new leader txn to their logs.
ZOOKEEPER-1081. modify leader/follower code to correctly deal with new leader
ZOOKEEPER-1082. modify leader election to correctly take into account current