Fix for thread control tests on linux.

The 'netstat -i -c' command, when run as an unprivileged user, appears
to output nothing. This makes our tests fail because we rely on it
outputing something every second.

Change to using ping.

streamedinput.py

@@ -154,9 +154,10 @@ class StreamedInput(object):
             else:
                 stopped = 'running'
 
-        return "StreamedInput(command=%r, shell=%r, buffer_size=%s; " \
+        return "%s(command=%r, shell=%r, buffer_size=%s; " \
                "started=%s, stopped=%s, data_function=%s%s)" % \
-               (self.command, self.shell, self.buffer_size,
+               (self.__class__.__name__,
+                self.command, self.shell, self.buffer_size,
                 self.proc is not None, stopped, datafunc, extra)
 
     def _set_nonblocking(self):

streamedinput_test.py

@@ -509,9 +509,9 @@ class TestThreaded90ThreadControl(BaseThreadedInput):
     def __init__(self, *args, **kwargs):
         super(TestThreaded90ThreadControl, self).__init__(*args, **kwargs)
         if sys.platform == 'darwin':
-            self.netstat = ['netstat', '-i', '-w1']
+            self.cmd = ['netstat', '-i', '-w1']
         elif sys.platform.startswith('linux'):
-            self.netstat = ['netstat', '-i', '-c']
+            self.cmd = ['ping', '-c', '4', '127.0.0.1']
         else:
             raise NotImplementedError
 
@@ -522,7 +522,7 @@ class TestThreaded90ThreadControl(BaseThreadedInput):
         super(TestThreaded90ThreadControl, self).tearDown()
 
     def test_001_start_and_stop_long_process(self):
-        self.si = streamedinput.StreamedInput(self.netstat)
+        self.si = streamedinput.StreamedInput(self.cmd)
         self.si.start()
         time.sleep(0.1)
         initial_datalen = len(self.si)
@@ -548,7 +548,7 @@ class TestThreaded90ThreadControl(BaseThreadedInput):
         self.assertTrue(self.si.eof(), "We should now be at the end of the list, and the process should be gone")
 
     def test_002_context_handler_stops(self):
-        with streamedinput.ThreadedStreamedInput(self.netstat) as self.si:
+        with streamedinput.ThreadedStreamedInput(self.cmd) as self.si:
             test_process = psutil.Process(self.si.proc.pid)
             self.assertTrue(self.si.is_running(), "Process should be running")