update errata to use filter method

- replaced duplicated filter query with method
  ErrataConnector::filter
- fixup unittests to use paginated api
- add fixture symlinks for exteranl_tests api

Author: yazug

errata_tool/erratum.py

@@ -454,13 +454,10 @@ def externalTests(self, test_type=None):
         :param test_type: str, like "rpmdiff" or "covscan"
         :returns: a possibly-empty list of dicts, one per result.
         """
-        tmpl = '/api/v1/external_tests/?filter[active]=true'
-        tmpl += '&filter[errata_id]={errata_id}'
-        if test_type:
-            tmpl += '&filter[test_type]={test_type}'
-        url = tmpl.format(errata_id=self.errata_id, test_type=test_type)
-        data = self.get_paginated_data(url)
-        return data
+        response = self.filter('/api/v1/external_tests', 'filter',
+                               active='true', errata_id=self.errata_id,
+                               test_type=test_type, paginated=True)
+        return response['data']
 
     def _get_build_list(self, check_signatures=False):
         # Grab build list; store on a per-key basis

errata_tool/tests/fixtures/errata.devel.redhat.com/api/v1/external_tests?filter[active]=true&filter[errata_id]=33840&filter[paginated]=True&filter[test_type]=rpmdiff&page[number]=1

@@ -0,0 +1 @@
+external_tests/?filter[active]=true&filter[errata_id]=33840&filter[test_type]=rpmdiff&page[number]=1

errata_tool/tests/fixtures/errata.devel.redhat.com/api/v1/external_tests?filter[active]=true&filter[errata_id]=33840&filter[paginated]=True&filter[test_type]=rpmdiff&page[number]=2

@@ -0,0 +1 @@
+external_tests/?filter[active]=true&filter[errata_id]=33840&filter[test_type]=rpmdiff&page[number]=2

errata_tool/tests/fixtures/errata.devel.redhat.com/api/v1/external_tests?filter[active]=true&filter[errata_id]=33840&filter[test_type]=rpmdiff

@@ -0,0 +1 @@
+external_tests/?filter[active]=true&filter[errata_id]=33840&filter[test_type]=rpmdiff&page[number]=1

errata_tool/tests/test_external_tests.py

@@ -6,7 +6,7 @@ class TestExternalTests(object):
     def test_external_tests_url(self, monkeypatch, mock_get, advisory):
         monkeypatch.setattr(requests, 'get', mock_get)
         advisory.externalTests(test_type='rpmdiff')
-        assert mock_get.response.url == 'https://errata.devel.redhat.com/api/v1/external_tests/?filter[active]=true&filter[errata_id]=33840&filter[test_type]=rpmdiff&page[number]=2'  # NOQA: E501
+        assert mock_get.response.url == 'https://errata.devel.redhat.com/api/v1/external_tests?filter[active]=true&filter[errata_id]=33840&filter[paginated]=True&filter[test_type]=rpmdiff&page[number]=2'  # NOQA: E501
 
     def test_external_tests_data(self, monkeypatch, mock_get, advisory):
         monkeypatch.setattr(requests, 'get', mock_get)