[ACTS] Autotest wrapper for ACTS.

Initial check-in of the Autotest wrapper for ACTS.
This can execute basic ACTS tests and report results.

BUG=b:24907406
TEST=Create /usr/local/comms, copy the comms repo here and chmod
it for all users. Edit the sample_config.json file to match your
test station paths. Then run one of:
1) ./test_droid.py ZX1G22JHXN android_ACTS.SampleTest --remote \
   android1758-wifi-test-station-2.cros
2) ./test_droid.py ZX1G22JHXN android_ACTS --remote \
android1758-wifi-test-station-2.cros --args \
"config_file=sample_config.txt test_case=SampleTest test_bed=SampleTestBed"

Change-Id: I128ad22c4eaf738a2cfb8cb2094e0b1052b3705d
Reviewed-on: https://chromium-review.googlesource.com/309911
Commit-Ready: Simran Basi <sbasi@chromium.org>
Tested-by: Simran Basi <sbasi@chromium.org>
Reviewed-by: Simran Basi <sbasi@chromium.org>

site_utils/test_runner_utils.py

diff --git a/site_utils/test_runner_utils.py b/site_utils/test_runner_utils.py
index c58b696..8a6192d 100755
--- a/site_utils/test_runner_utils.py
+++ b/site_utils/test_runner_utils.py
@@ -34,7 +34,7 @@
 _sigint_handler_lock = threading.Lock()
 
 _AUTOSERV_SIGINT_TIMEOUT_SECONDS = 5
-_NO_BOARD = 'ad_hoc_board'
+NO_BOARD = 'ad_hoc_board'
 NO_BUILD = 'ad_hoc_build'
 _SUITE_REGEX = r'suite:(.*)'
 
@@ -110,7 +110,7 @@
 
 
 def fetch_local_suite(autotest_path, suite_predicate, afe, test_arg, remote,
-                      build=NO_BUILD, board=_NO_BOARD,
+                      build=NO_BUILD, board=NO_BOARD,
                       results_directory=None, no_experimental=False,
                       ignore_deps=True):
     """Create a suite from the given suite predicate.
@@ -433,7 +433,7 @@
 
 
 def perform_local_run(afe, autotest_path, tests, remote, fast_mode,
-                      build=NO_BUILD, board=_NO_BOARD, args=None,
+                      build=NO_BUILD, board=NO_BOARD, args=None,
                       pretend=False, no_experimental=False,
                       ignore_deps=True,
                       results_directory=None, ssh_verbosity=0,
@@ -603,7 +603,7 @@
 
 
 def perform_run_from_autotest_root(autotest_path, argv, tests, remote,
-                                   build=NO_BUILD, board=_NO_BOARD, args=None,
+                                   build=NO_BUILD, board=NO_BOARD, args=None,
                                    pretend=False, no_experimental=False,
                                    ignore_deps=True,
                                    results_directory=None, ssh_verbosity=0,