Use assertTrue/False instead of assertEqual(T/F)

The usage of assertEqual(True/False, ***) should be changed
to a meaningful format of assertTrue/False(***).

Change-Id: Id708a94ac461adf021893a05796163bd2ced153c
Closes-Bug:#1512207

watcher/tests/api/v1/test_types.py

@@ -228,7 +228,7 @@ class TestJsonType(base.TestCase):
         value = vt.validate(0.123)
         self.assertEqual(0.123, value)
         value = vt.validate(True)
-        self.assertEqual(True, value)
+        self.assertTrue(value)
         value = vt.validate([1, 2, 3])
         self.assertEqual([1, 2, 3], value)
         value = vt.validate({'foo': 'bar'})