Due to the added attach/detach tracing in the netmgr-v2 code, the libns tests needs to be adjusted as the real function names have changed from isc_nmhandle_* to isc__nmhandle_*.
Due to the added attach/detach tracing in the netmgr-v2 code, the libns tests needs to be adjusted as the real function names have changed from isc_nmhandle_* to isc__nmhandle_*.