punch wan_mac through cordsubscriber API
diff --git a/xos/core/xoslib/methods/cordsubscriber.py b/xos/core/xoslib/methods/cordsubscriber.py
index 792bc42..5742c9c 100644
--- a/xos/core/xoslib/methods/cordsubscriber.py
+++ b/xos/core/xoslib/methods/cordsubscriber.py
@@ -49,6 +49,8 @@
         nat_ip = ReadOnlyField()
         private_ip = ReadOnlyField()
 
+        wan_mac = ReadOnlyField()
+
         humanReadableName = serializers.SerializerMethodField("getHumanReadableName")
 
         class Meta:
@@ -60,7 +62,7 @@
                       'url_filter_enable', 'url_filter_rules', 'url_filter_level',
                       'bbs_account',
                       'ssh_command',
-                      'cdn_enable', 'vbng_id', 'routeable_subnet', 'nat_ip', 'lan_ip', 'wan_ip', 'private_ip')
+                      'cdn_enable', 'vbng_id', 'routeable_subnet', 'nat_ip', 'lan_ip', 'wan_ip', 'private_ip', 'wan_mac')
 
 
         def getHumanReadableName(self, obj):
diff --git a/xos/core/xoslib/objects/cordsubscriber.py b/xos/core/xoslib/objects/cordsubscriber.py
index 97624f1..4719a13 100644
--- a/xos/core/xoslib/objects/cordsubscriber.py
+++ b/xos/core/xoslib/objects/cordsubscriber.py
@@ -49,6 +49,7 @@
                      ("lan_ip", "vcpe.lan_ip"),
                      ("private_ip", "vcpe.private_ip"),
                      ("wan_ip", "vcpe.wan_ip"),
+                     ("wan_mac", "vcpe.wan_mac"),
                      )
 
     def __getattr__(self, key):