def _dpid_to_urn(dpid):
    return "%s+switch:%s" % (OPENFLOW_GAPI_RSC_URN_PREFIX, dpid)
Function that can be curried to provide the related column name for the m2m table
dataset/ETHPy150Open fp7-ofelia/ocf/expedient/src/python/plugins/openflow/plugin/gapi/rspec.py/_dpid_to_urn--crossover with--dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-0.96/django/db/models/fields/related.py/ManyToManyField._get_m2m_reverse_name