Pull out redis validation into validator class

test/test_validate_config.py

@@ -31,17 +31,6 @@ class TestValidateConfig(unittest.TestCase):
     config['TESTING'] = True
     VALIDATORS[service](config, user, password)
 
-  def test_validate_redis(self):
-    with self.assertRaisesRegexp(ConfigValidationException, 'Missing redis hostname'):
-      self.validate('redis', {})
-
-    with self.assertRaises(redis.ConnectionError):
-      self.validate('redis', {
-        'BUILDLOGS_REDIS': {
-          'host': 'somehost',
-        },
-      })
-
   def test_validate_mail(self):
     # Skip mail.
     self.validated.add('mail')