'Verify authorized realms to see if they match those given to token.
:param token: An access token string.
:param realms: A list of realms the client attempts to access.
:param request: An oauthlib.common.Request object.
:returns: True or False
This prevents the list of authorized realms sent by the client during
the authorization step to be altered to include realms outside what
was bound with the request token.
Can be as simple as::
valid_realms = self.get_realms(token)
return all((r in valid_realms for r in realms))
This method is used by
* AuthorizationEndpoint'

def verify_realms(self, token, realms, request):

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