CORD-1954: Remove obsolete files;
fix latlng validation;
replace prints with logging

Change-Id: I88d98667839a34f0e6fb3c70369ce20ece80cb04
(cherry picked from commit d536a89fe822582e34dd075ce6dfb8a9476f7531)
diff --git a/xos/attic/usernetworkinterface_model.py b/xos/attic/usernetworkinterface_model.py
index e48251c..121611e 100755
--- a/xos/attic/usernetworkinterface_model.py
+++ b/xos/attic/usernetworkinterface_model.py
@@ -14,9 +14,7 @@
 # limitations under the License.
 
 
-def __unicode__(self):  return u'%s' % (self.name)
-
-def save(self, *args, **kwargs):
+def __xos_save_base(self, *args, **kwargs):
 
     if self.latlng:
         try:
@@ -33,4 +31,5 @@
         except:
             raise ValueError("The lat/lng value is not formatted correctly.")
 
-    super(UserNetworkInterface, self).save(*args, **kwargs)
+    return False # let xosbase know to save the model
+