public static Path getSessionPath(TenantName tenantName, long sessionId) {
        return TenantRepository.getSessionsPath(tenantName).append(String.valueOf(sessionId));
    }
Create necessary paths atomically for a new session.

@param createTime Time of session creation.
configserver/src/main/java/com/yahoo/vespa/config/server/session/SessionZooKeeperClient.java