public void write(Map<Version, FileRegistry> fileRegistryMap) {
            for (Map.Entry<Version, FileRegistry> versionFileRegistryEntry : fileRegistryMap.entrySet()) {
                write(versionFileRegistryEntry.getKey(), versionFileRegistryEntry.getValue());
            }
        }
Gets a full ZK application path

@param trailingPath trailing part of path to be appended to ZK app path
@return a String with the full ZK application path including trailing path, if set
configserver/src/main/java/com/yahoo/vespa/config/server/deploy/ZooKeeperDeployer.java