Remove default getattr values in RouterFipRateLimitMaps
Remove default getattr values in RouterFipRateLimitMaps

When retrieving the class attributes, used as cache variables, the
getattr function should always return a class member and not a default
value, raising an exception if the attribute does not exist.

In case of using the default value, the data could be stored in a
temporary variable not stored in the class.

TrivialFix

Change-Id: Ib6bd097ec5fc55a3447b5406d5e4c5e3976b48ab

openstack/neutron,openstack/neutron,mahak/neutron,openstack/neutron,mahak/neutron,mahak/neutron