statd: Add 'admin-status' to yanger

The interface operational data was missing the 'admin-status' parameter,
which indicates whether an interface is administratively enabled or
disabled. To resolve this, the 'admin-status' was added to the yanger

Fixes #700

src/statd/python/yanger/yanger.py

@@ -664,6 +664,15 @@ def add_ip_link(ifname, iface_in, iface_out):
     if 'link' in iface_in and not iface_is_dsa(iface_in):
         insert(iface_out, "infix-interfaces:vlan", "lower-layer-if", iface_in['link'])
 
+    if 'flags' in iface_in:
+        admin_xlate = { 
+            "UP": "up", 
+            "DOWN": "down" 
+            }
+
+        admin_status = admin_xlate.get("UP" if "UP" in iface_in['flags'] else "DOWN", "testing")
+        iface_out['admin-status'] = admin_status
+
     if 'operstate' in iface_in:
         xlate = {
                 "DOWN":                "down",