Enable igmp test to work under voltha.
Also change cordSubscriber voltha test to work with the voltha auto configure.
Import teardown_module as well in other test cases.
The tests that are not supposed to work with voltha or rely on auto configure should set:
VOLTHA_AUTO_CONFIGURE = False
in their test class.

Change-Id: Ibbe60e524d31e7079e0423e9e3c390ee17dee2a7
diff --git a/src/test/dhcp/dhcpTest.py b/src/test/dhcp/dhcpTest.py
index c6a3d0d..f54af5f 100644
--- a/src/test/dhcp/dhcpTest.py
+++ b/src/test/dhcp/dhcpTest.py
@@ -24,7 +24,7 @@
 from OnosCtrl import OnosCtrl
 from portmaps import g_subscriber_port_map
 from CordLogger import CordLogger
-from CordTestConfig import setup_module
+from CordTestConfig import setup_module, teardown_module
 from CordTestUtils import log_test
 log_test.setLevel('INFO')