'Get the default realms for a client.
:param client_key: The client/consumer key.
:param request: An oauthlib.common.Request object.
:returns: The list of default realms associated with the client.
The list of default realms will be set during client registration and
is outside the scope of OAuthLib.
This method is used by
* RequestTokenEndpoint'

def get_default_realms(self, client_key, request):

    raise NotImplementedError(u'Subclasses    must    implement    this    function.')
