[autotest] Modify option no_wait for a suite job to fire and forget

no_wait is an option in run_suite for the script to exit without waiting for
the suite job to finish.

To prevent a suite job from holding on a process slot in drone for a long time.
The usage of no_wait option is expended so that the suite job can exit once all
test jobs are created, without waiting for all test jobs to finish.

related CL for test_suites:
https://chromium-review.googlesource.com/#/c/177309/

BUG=chromium:316990
TEST=trybot build: trybot-lumpy-paladin/R33-4997.0.0-b1385
then run_suite in local setup:
./run_suite.py --build=lumpy-release/R33-4933.0.0  --board=lumpy
--suite_name=dummy  -p bvt --no_wait=True
Confirm the suite job is completed right after the test jobs are scheduled.

DEPLOY=apache

Change-Id: I039a50371f9c5ebe8c8e155a9aabfb37999be4e2
Reviewed-on: https://chromium-review.googlesource.com/176601
Tested-by: Dan Shi <dshi@chromium.org>
Reviewed-by: Alex Miller <milleral@chromium.org>
Reviewed-by: Fang Deng <fdeng@chromium.org>
Commit-Queue: Dan Shi <dshi@chromium.org>
diff --git a/frontend/afe/site_rpc_interface.py b/frontend/afe/site_rpc_interface.py
index fc7de1f..f69da13 100644
--- a/frontend/afe/site_rpc_interface.py
+++ b/frontend/afe/site_rpc_interface.py
@@ -81,7 +81,7 @@
 def create_suite_job(suite_name, board, build, pool, check_hosts=True,
                      num=None, file_bugs=False, timeout=24, timeout_mins=None,
                      priority=priorities.Priority.DEFAULT,
-                     suite_args=None):
+                     suite_args=None, wait_for_results=True):
     """
     Create a job to run a test suite on the given device with the given image.
 
@@ -104,6 +104,8 @@
     @param suite_args: Optional arguments which will be parsed by the suite
                        control file. Used by control.test_that_wrapper to
                        determine which tests to run.
+    @param wait_for_results: Set to False to run the suite job without waiting
+                             for test jobs to finish. Default is True.
 
     @raises ControlFileNotFound: if a unique suite control file doesn't exist.
     @raises NoControlFileList: if we can't list the control files at all.
@@ -152,7 +154,8 @@
                    'timeout_mins': timeout_mins,
                    'devserver_url': ds.url(),
                    'priority': priority,
-                   'suite_args' : suite_args
+                   'suite_args' : suite_args,
+                   'wait_for_results': wait_for_results
                    }
 
     control_file = tools.inject_vars(inject_dict, control_file_in)