Consolidate membership management
Review Request #4729 - Created April 15, 2012 and updated
https://issues.apache.org/jira/browse/ZOOKEEPER-1411 Currently every server has a different configuration file. With this patch, we will have all cluster membership definitions in a single file, and every sever can have a copy of this file.
Many tests were updated to work with the new configuration format. MembershipBCTest.java tests backward compatibility.