code: def create(cls, name, vss_def=None):
          
          vss_def = {} if vss_def is None else vss_def
          json = {
              'master_type': 'dcl2fw',
              'name': name,
              'vss_isc': vss_def
          }
          return ElementCreator(cls, json)
docs: Create a VSS Container. This maps to the Service Manager
          within NSX.
  
          vss_def is optional and has the following definition:
  
              {"isc_ovf_appliance_model": 'virtual',
               "isc_ovf_appliance_version": '',
               "isc_ip_address": '192.168.4.84', # IP of manager, i.e. OSC
               "isc_vss_id": '',
               "isc_virtual_connector_name": 'smc-python'}
  
          :param str name: name of container
          :param dict vss_def: dict of optional settings
          :raises CreateElementFailed: failed creating with reason
          :rtype: VSSContainer