void createLocalSession(long sessionId, ApplicationPackage applicationPackage) {
        SessionZooKeeperClient sessionZKClient = createSessionZooKeeperClient(sessionId);
        LocalSession session = new LocalSession(tenantName, sessionId, applicationPackage, sessionZKClient);
        addLocalAndRemoteSession(session);
    }
Returns a new session instance for the given session id.
configserver/src/main/java/com/yahoo/vespa/config/server/session/SessionRepository.java