fixed byte/str issue in coreapi tlv mac addr

daemon/core/api/tlv/coreapi.py

@@ -326,7 +326,7 @@ class CoreTlvDataMacAddr(CoreTlvDataObj):
         :return:
         """
         # extend to 64 bits
-        return "\0\0" + obj.addr
+        return b"\0\0" + obj.addr
 
     @staticmethod
     def new_obj(value):

daemon/core/api/tlv/structutils.py

@@ -38,7 +38,7 @@ def pack_values(clazz, packers):
             value = transformer(value)
 
         # pack and add to existing data
-        logging.debug("packing: %s - %s", tlv_type, value)
+        logging.debug("packing: %s - %s type(%s)", tlv_type, value, type(value))
         data += clazz.pack(tlv_type.value, value)
 
     return data