Re-enable test_connection tests

Re-enable the TestGerritConnection and TestConnections test cases.

Change-Id: I23c12b23546102212990b2dca7369741efa990b6
diff --git a/tests/test_connection.py b/tests/test_connection.py
index c128741..b3c133c 100644
--- a/tests/test_connection.py
+++ b/tests/test_connection.py
@@ -21,9 +21,6 @@
 
 
 class TestGerritConnection(testtools.TestCase):
-    def setUp(self):
-        self.skip("Disabled for early v3 development")
-
     log = logging.getLogger("zuul.test_connection")
 
     def test_driver_name(self):
@@ -32,11 +29,8 @@
 
 
 class TestConnections(ZuulTestCase):
-    def setUp(self):
-        self.skip("Disabled for early v3 development")
-
-    def setup_config(self, config_file='zuul-connections-same-gerrit.conf'):
-        super(TestConnections, self).setup_config(config_file)
+    config_file = 'zuul-connections-same-gerrit.conf'
+    tenant_config_file = 'config/zuul-connections-same-gerrit/main.yaml'
 
     def test_multiple_connections(self):
         "Test multiple connections to the one gerrit"