[#714] Fix some solr package search tests

CKAN used to convert 'sort': 'rank' into 'sort': 'score desc, namae asc'
but since commit ca04063 ([#714] Fix
default sort ordering) it no longer does this, which breaks these tests.
Update the tests to pass 'score desc, name asc' directly instead.

ckan/tests/lib/test_solr_package_search.py

@@ -363,7 +363,7 @@ def teardown_class(self):
     def _do_search(self, q, expected_pkgs, count=None):
         query = {
             'q': q,
-            'sort': 'rank'
+            'sort': 'score desc, name asc'
         }
         result = search.query_for(model.Package).run(query)
         pkgs = result['results']
@@ -472,7 +472,7 @@ def teardown_class(self):
     def _do_search(self, q, wanted_results):
         query = {
             'q': q,
-            'sort': 'rank'
+            'sort': 'score desc, name asc',
         }
         result = search.query_for(model.Package).run(query)
         results = result['results']