[PowerProfiler] Make sure correct version of pySerial is imported with monsoon profiler.

tools/telemetry/telemetry/core/util_unittest.py

Index: tools/telemetry/telemetry/core/util_unittest.py
diff --git a/tools/telemetry/telemetry/core/util_unittest.py b/tools/telemetry/telemetry/core/util_unittest.py
index 05df311add92e3cd88288185694dbfc19e946b2a..2e8a35b2f0c47fb6e705f1de1d88b2584bae4a2b 100644
--- a/tools/telemetry/telemetry/core/util_unittest.py
+++ b/tools/telemetry/telemetry/core/util_unittest.py
@@ -62,3 +62,8 @@ class TestGetSequentialFileName(unittest.TestCase):
 
   def tearDown(self):
     shutil.rmtree(self.test_directory)
+
+class PySerialVersionTest(unittest.TestCase):

[qsr, 2014/06/11 12:24:21]

Don't you need to call AddDirToPythonPath? Is it only working because something
else has been doing this before you?

[vivekg, 2014/06/11 12:41:41]

Yes you are right. We should call AddDirToPythonPath for the completeness of the
test. I will change it.

The reason its working is because of telemetry/core/platform/profiler/monsoon.py
is calling this function at the import statement. 

[qsr, 2014/06/11 13:23:38]

 If your test was not failing, it is probably not the right one. Moreover, it
will break when we update pyserial for no good reason.

 What about creating 2 directories with 2 stupid module with the same name and a
variable with 2 different values, and checking that the order of import matters.

+  def testPySerialVersion(self):
+    import serial
+    self.assertEqual(serial.VERSION, '2.7')