Moved event bus to common lib

Change-Id: I530498db2d4fd3ba644dd4a92e0b6ce74bce3a27
diff --git a/tests/utests/common/__init__.py b/tests/utests/common/__init__.py
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/tests/utests/common/__init__.py
diff --git a/tests/utests/voltha/core/test_event_bus.py b/tests/utests/common/test_event_bus.py
similarity index 98%
rename from tests/utests/voltha/core/test_event_bus.py
rename to tests/utests/common/test_event_bus.py
index f937722..532befb 100644
--- a/tests/utests/voltha/core/test_event_bus.py
+++ b/tests/utests/common/test_event_bus.py
@@ -20,7 +20,7 @@
 from twisted.internet.defer import DeferredQueue, inlineCallbacks
 from twisted.trial.unittest import TestCase
 
-from voltha.core.event_bus import EventBusClient, EventBus
+from common.event_bus import EventBusClient, EventBus
 
 
 class TestEventBus(TestCase):