Hawkey tests: fix filtering on requires by passing a query

Fixes tests after allowing to pass a query (or an iterable of packages)
as an argument to dependency filters (requires, suggests, etc.) in
"Query: add a dependency by solvable filter".

Drops the exception check and adds a simple test for the new
functionality.

python/hawkey/tests/tests/test_query.py

@@ -352,12 +352,17 @@ def test_obsoletes(self):
         q = hawkey.Query(self.sack).filter(name="penny")
         o = hawkey.Query(self.sack)
         self.assertRaises(hawkey.QueryException, o.filter, obsoletes__gt=q)
-        self.assertRaises(hawkey.ValueException, o.filter, requires=q)
 
         o = hawkey.Query(self.sack).filter(obsoletes=q)
         self.assertLength(o, 1)
         self.assertEqual(str(o[0]), "fool-1-5.noarch")
 
+    def test_requires_with_package_list(self):
+        q = hawkey.Query(self.sack).filter(name="fool")
+        o = hawkey.Query(self.sack).filter(requires=q)
+        self.assertLength(o, 1)
+        self.assertEqual(str(o[0]), "walrus-2-6.noarch")
+
     def test_subquery_evaluated(self):
         q = hawkey.Query(self.sack).filter(name="penny")
         self.assertFalse(q.evaluated)