VOL-1451 Openonu now runs using pyvoltha completely

Remove code that now exists in the library.  Modify include paths
Update requirements to more closely reflect pyvoltha requirements.txt

Change-Id: I94c619de82d8ee14cfeb302b3b82be3a26619301
diff --git a/python/adapters/brcm_openomci_onu/omci/brcm_get_mds_task.py b/python/adapters/brcm_openomci_onu/omci/brcm_get_mds_task.py
index eabf356..16a8783 100644
--- a/python/adapters/brcm_openomci_onu/omci/brcm_get_mds_task.py
+++ b/python/adapters/brcm_openomci_onu/omci/brcm_get_mds_task.py
@@ -14,7 +14,7 @@
 # limitations under the License.
 
 import structlog
-from voltha.extensions.omci.tasks.get_mds_task import GetMdsTask
+from pyvoltha.adapters.extensions.omci.tasks.get_mds_task import GetMdsTask
 
 
 class BrcmGetMdsTask(GetMdsTask):