Remove override of 'expected_error_codes' with defaults

'expected_error_codes' are filled with defaults error code[1]
in base class which is nothing but to fill required number
of error codes with 403.

Few tests override the 'expected_error_codes' with 403 itself which
is confusing and inconsistent with other tests.

This commit removes those default overridden values.

[1] https://github.com/openstack/patrole/blob/a6371ed510b318183e1c2cbafcc97bd85f6625f8/patrole_tempest_plugin/rbac_rule_validation.py#L286

Change-Id: If607755fc09c392566fffad8f46e5f37cd33c2d2
7 files changed