Incorrect validator_kwarg filtering for django GenericIPAddressField

[IgoryanM]

When mapping django GenericIPAddressField excludes only validate_ipv46_address function.
If protocol is defined, ipv4 for example, in django field, function validate_ipv4_address will be added to validator_kwarg.

Then when initiating rest IPAddressField self.validators will have validate_ipv4_address and validate_ipv46_address. Then we have two validations and two messages about same error.

Additionally will be good to get protocol arg from django GenericIPAddressField to rest IPAddressField.

django-rest-framework/rest_framework/utils/field_mapping.py

Lines 183 to 188 in df60510

	# IPAddressField do not need to include the 'validate_ipv46_address' argument,
	if isinstance(model_field, models.GenericIPAddressField):
	validator_kwarg = [
	validator for validator in validator_kwarg
	if validator is not validators.validate_ipv46_address
	]