Add is_open property to NetworkController

telemetry/telemetry/core/network_controller.py

Index: telemetry/telemetry/core/network_controller.py
diff --git a/telemetry/telemetry/core/network_controller.py b/telemetry/telemetry/core/network_controller.py
index 0932ab0badad349a6a5ff66171844c72ae4c3def..d6d321bfb3cb7f74eb21cfe6a58b773ebf07d162 100644
--- a/telemetry/telemetry/core/network_controller.py
+++ b/telemetry/telemetry/core/network_controller.py
@@ -15,6 +15,10 @@ class NetworkController(object):
   def Open(self, wpr_mode, netsim, extra_wpr_args):
     self._network_controller_backend.Open(wpr_mode, netsim, extra_wpr_args)
 
+  @property
+  def is_open(self):
+    return self._network_controller_backend.is_open
+
   def Close(self):
     self._network_controller_backend.Close()