ZOOKEEPER-1994. Auto-backup configuration files; config version becomes part of filename (Hongchao Deng via shralex)

git-svn-id: https://svn.apache.org/repos/asf/zookeeper/branches/branch-3.5@1617887 13f79535-47bb-0310-9956-ffa450edef68
ZOOKEEPER-2008. Missing leader election port in system test. (Kfir Lev-Ari via Alex Shraer).

git-svn-id: https://svn.apache.org/repos/asf/zookeeper/branches/branch-3.5@1617893 13f79535-47bb-0310-9956-ffa450edef68