Implement remove_port

Change-Id: Id070ad1eeebe61c563b8ff08911a63ac35a2313d
diff --git a/admin.py b/admin.py
index 4c26f03..07578f5 100644
--- a/admin.py
+++ b/admin.py
@@ -300,6 +300,12 @@
         print 'Deleted switch_id %d' % switch_id
     except InputError as inst:
         print 'Failed: %s' % inst
+elif opts.remove_port is not None:
+    try:
+        port_id = db.delete_port(opts.remove_port)
+        print 'Deleted port_id %d' % port_id
+    except InputError as inst:
+        print 'Failed: %s' % inst
 else:
     print 'No recognised command give. Try -h for help'