stethoscope: handle user/password like mclient
stethoscope: handle user/password like mclient

Drop --password/-P argument, don't die for missing user or password, but
prompt like mclient does.

zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb