PAPI: Add MACAddress object wrapper for vl_api_mac_address_t

Change the definition of vl_api_mac_address_t to an aliased type.

Change-Id: I1434f316d0fad6a099592f39bceeb8faeaf1d134
Signed-off-by: Ole Troan <ot@cisco.com>
diff --git a/src/vpp-api/python/vpp_papi/vpp_papi.py b/src/vpp-api/python/vpp_papi/vpp_papi.py
index 4de257c..9c4ede9 100644
--- a/src/vpp-api/python/vpp_papi/vpp_papi.py
+++ b/src/vpp-api/python/vpp_papi/vpp_papi.py
@@ -28,6 +28,7 @@
 import atexit
 from . vpp_serializer import VPPType, VPPEnumType, VPPUnionType, BaseTypes
 from . vpp_serializer import VPPMessage, vpp_get_type, VPPTypeAlias
+from . macaddress import MACAddress, mac_pton, mac_ntop
 
 logger = logging.getLogger(__name__)
 
@@ -57,6 +58,7 @@
         vpp_instance.logger.debug('Cleaning up VPP on exit')
         vpp_instance.disconnect()
 
+
 if sys.version[0] == '2':
     def vpp_iterator(d):
         return d.iteritems()