Put cleanup steps in finally block so cleanup happens after halt on failure.

The device_status_check hangs because there are still processes launched by the
buildbot script that are not cleaned up. E.g.
https://chromegw.corp.google.com/i/clank/builders/manta-sharded-official-perf-clankium/builds/2359
This makes sure the post commands are executed after halt on failure.

BUG=265578

Review URL: https://chromiumcodereview.appspot.com/21261006

git-svn-id: http://src.chromium.org/svn/trunk/src/build@215365 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

android/buildbot/bb_device_steps.py

@@ -306,14 +306,8 @@ def GenerateTestReport(options):
     os.remove(report)
 
 
-def GetPostTestStepCmds():
-  return [
-      ('logcat_dump', LogcatDump),
-      ('test_report', GenerateTestReport)
-  ]
-
-
 def MainTestWrapper(options):
+  try:
     # Spawn logcat monitor
     SpawnLogcatMonitor()
 
@@ -331,9 +325,13 @@ def MainTestWrapper(options):
     if options.experimental:
       RunTestSuites(options, gtest_config.EXPERIMENTAL_TEST_SUITES)
 
+  finally:
     # Run all post test steps
-  for _, cmd in GetPostTestStepCmds():
-    cmd(options)
+    LogcatDump(options)
+    GenerateTestReport(options)
+    # KillHostHeartbeat() has logic to check if heartbeat process is running,
+    # and kills only if it finds the process is running on the host.
+    provision_devices.KillHostHeartbeat()
 
 
 def GetDeviceStepsOptParser():
@@ -377,7 +375,6 @@ def main(argv):
   setattr(options, 'target', options.factory_properties.get('target', 'Debug'))
 
   MainTestWrapper(options)
-  provision_devices.KillHostHeartbeat()
 
 
 if __name__ == '__main__':