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/trunk@1617886 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/trunk@1617892 13f79535-47bb-0310-9956-ffa450edef68
ZOOKEEPER-2008-Fix. Correcting small issue in committed 2008 patch.

git-svn-id: https://svn.apache.org/repos/asf/zookeeper/trunk@1617921 13f79535-47bb-0310-9956-ffa450edef68
satisfy