Kill forwarder2 host daemon in python_test_sharder.py during setup.

build/android/pylib/host_driven/python_test_sharder.py

Index: build/android/pylib/host_driven/python_test_sharder.py
diff --git a/build/android/pylib/host_driven/python_test_sharder.py b/build/android/pylib/host_driven/python_test_sharder.py
index 4a67ddf7106abf9e39d0a8cb6b66d39f33056f7b..cc746878ef3ba6acb7476b0dd28cc33723a353a7 100644
--- a/build/android/pylib/host_driven/python_test_sharder.py
+++ b/build/android/pylib/host_driven/python_test_sharder.py
@@ -10,6 +10,7 @@ import multiprocessing
 
 from pylib.base import base_test_result
 from pylib.base import sharded_tests_queue
+from pylib.forwarder import Forwarder
 
 from python_test_caller import CallPythonTest
 
@@ -120,6 +121,9 @@ class PythonTestSharder(object):
     logging.warning('*' * 80)
     final_results = base_test_result.TestRunResults()
     tests_to_run = self.tests
+
+    Forwarder.KillHost()
+
     for retry in xrange(self.retries):
       logging.warning('Try %d of %d', retry + 1, self.retries)
       self._SetupSharding(self.tests)