add new test case which covers the nfsdcld service
    
    The nfsdcld service was not confined by SELinux, which means that
    it ran under unconfined_service_t context. Processes running under
    unconfined_service_t pose a security risk, which is seen as bug.
    
    From now on, the nfsdcld service is confined by SELinux and it
    should run under rpcd_t context.
    
    The TC runs the service in default configuration to find out if
    there are any SELinux denials triggered.