suites/4g/ping.py: Overwrite test stdout with ping output

Change-Id: I83403a21c46758132b4fbb930000df67d8650016
diff --git a/suites/4g/ping.py b/suites/4g/ping.py
index b44ff84..17eee78 100755
--- a/suites/4g/ping.py
+++ b/suites/4g/ping.py
@@ -19,4 +19,7 @@
 wait(ue.is_connected, None)
 print('UE is attached')
 
-ue.run_netns_wait('ping', ('ping', '-c', '10', epc.tun_addr()))
+proc = ue.run_netns_wait('ping', ('ping', '-c', '10', epc.tun_addr()))
+output = proc.get_stdout()
+print(output)
+test.set_report_stdout(output)