docs: def get_vlan_allocation(self):
          """Returns the status of the region's VLAN pool in CVX
  
          :returns: dictionary containg the assigned, allocated and available
                    VLANs for the region
          """
          if not self.cli_commands['resource-pool']:
              LOG.warning(_('The version of CVX you are using does not support'
                            'arista VLAN type driver.'))
          else:
              cmd = ['show openstack resource-pools region %s' % self.region]
              command_output = self._run_eos_cmds(cmd)
              if command_output:
                  regions = command_output[0]['physicalNetwork']
                  if self.region in regions.keys():
                      return regions[self.region]['vlanPool']['default']
          return {'assignedVlans': '',
                  'availableVlans': '',
                  'allocatedVlans': ''}