Load all available DRPs in 'entry_point'.

def iload(cls, entry_point='numina.pipeline.1'):
        """Load all available DRPs in 'entry_point'."""

        for entry in pkg_resources.iter_entry_points(group=entry_point):
            try:
                drp_loader = entry.load()
                drpins = drp_loader()
                if cls.instrumentdrp_check(drpins, entry.name):
                    yield drpins
            except Exception as error:
                print('Problem loading', entry, file=sys.stderr)
                print("Error is: ", error, file=sys.stderr)