test_fingerprint_order: work around dict items representation

In Python 3, the order of a dictionary items will be different than
under Python 2.  To not have to change the supporting code to return
OrderedDicts, let's just simplify the comparison, breaking them down
into each dictionary item.

This fixes the varianter_yaml_to_mux plugin unittest failure under
Python 3:

    ======================================================================
    FAIL: test_fingerprint_order (tests.test_mux.TestMuxTree)
    ----------------------------------------------------------------------
    Traceback (most recent call last):
      File "/home/cleber/src/avocado/avocado/optional_plugins/varianter_yaml_to_mux/tests/test_mux.py", line 231, in test_fingerprint_order
        self.assertEqual(str(variant1), "{'paths': '', 'variant': "
    AssertionError: "{'variant_id': 'child1-child2-9154', 'varia[65 chars] ''}" != "{'paths': '', 'variant': [TreeNode(name='ch[65 chars]54'}"
    - {'variant_id': 'child1-child2-9154', 'variant': [TreeNode(name='child1'), TreeNode(name='child2')], 'paths': ''}
    + {'paths': '', 'variant': [TreeNode(name='child1'), TreeNode(name='child2')], 'variant_id': 'child1-child2-9154'}
Signed-off-by: NCleber Rosa <crosa@redhat.com>

optional_plugins/varianter_yaml_to_mux/tests/test_mux.py

@@ -228,9 +228,18 @@ class TestMuxTree(unittest.TestCase):
         variant1 = next(iter(mux1))
         variant2 = next(iter(mux2))
         self.assertNotEqual(variant1, variant2)
-        self.assertEqual(str(variant1), "{'paths': '', 'variant': "
-                         "[TreeNode(name='child1'), TreeNode(name="
-                         "'child2')], 'variant_id': 'child1-child2-9154'}")
+        str_variant = str(variant1)
+        variant_list = []
+        for item in variant1:
+            variant_list.append("'%s': '%s'" % (item, variant1[item]))
+        expected_items = ["'paths': ''",
+                          "'variant': '[TreeNode(name='child1'), "
+                          "TreeNode(name='child2')]'",
+                          "'variant_id': 'child1-child2-9154'"]
+        for item in expected_items:
+            self.assertIn(item, variant_list)
+            variant_list.remove(item)
+        self.assertFalse(variant_list)
 
 
 class TestMultiplex(unittest.TestCase):