add delayed shutdown to test client (prevents cosmetic logging errors at service due to early connection shutdown)
add delayed shutdown to test client (prevents cosmetic logging errors at service due to early connection shutdown)

jeroenh/OpenNSA,jab1982/opennsa,NORDUnet/opennsa,NORDUnet/opennsa,jeroenh/OpenNSA,jeroenh/OpenNSA,NORDUnet/opennsa,jab1982/opennsa