[autotest] network_WiFi_PTK use proper capturehost am: 103c4fd34e am: a779ad3a4f am: c19e98098f
am: d76e624b00

Change-Id: I99e47e9dbff4d3aae6a86a40b88c34018442bffe
diff --git a/server/site_tests/network_WiFi_PTK/network_WiFi_PTK.py b/server/site_tests/network_WiFi_PTK/network_WiFi_PTK.py
index e2812b5..6a87f58 100644
--- a/server/site_tests/network_WiFi_PTK/network_WiFi_PTK.py
+++ b/server/site_tests/network_WiFi_PTK/network_WiFi_PTK.py
@@ -38,7 +38,7 @@
                     security_config=wpa_config)
         # TODO(wiley) This is just until we find the source of these
         #             test failures.
-        self.context.router.start_capture(ap_config.frequency)
+        self.context.capture_host.start_capture(ap_config.frequency)
         self.context.configure(ap_config)
         assoc_params = xmlrpc_datatypes.AssociationParameters(
                 ssid=self.context.router.get_ssid(),
@@ -61,3 +61,4 @@
                                     ping_result.loss)
         self.context.client.shill.disconnect(assoc_params.ssid)
         self.context.router.deconfig()
+        self.context.capture_host.stop_capture()