Added support for defining additional environment variables in settings to pass to the subprocess launched by the celery task, specify HOME and USER in settings by default instead of supervisord configuration.

app_setup/templates/local_settings.py.j2

@@ -103,3 +103,7 @@ LOGGING['handlers']['syslog'] = {
 #    'filename': os.path.join(BASE_DIR, 'awx.log'),
 #    'formatter': 'simple',
 #}
+
+# Define additional environment variables to be passed to subprocess started by
+# the celery task.
+#AWX_TASK_ENV['FOO'] = 'BAR'