[FABRIC-452] Minimize the IZKClient direct invocations as much as possible.
[FABRIC-452] Replace zookeeper client with curator.
[FABRIC-452] Align fabric-git-hawtio with curator.
[FABRIC-452] Align cluster-list command with curator. Add missing getters/setters to git/zk Bridge. Fix Groups to only trigger update, when data are really updated.
[ENTESB-715] Upgrade to latest pax-web version.
Delegate to Fabric Service for retrieving the zookeeper url.
Temporary fix: Make sure war feature is installed before fabric-agent on child containers, so that the war url handler can be used by the DeploymentAgent.