Adds multi-tast.py script

This script should allow to run multiple powerhtl tasts mutiple times.

BUG=None
TEST=(after labtunnel powerhtl is set up) ./multi_tast.py
-trace_path=./traces localhost:2200 config.json

Example input/output: https://paste.googleplex.com/4958975655411712

Change-Id: I2c6053b18384a71c68a8cd6f8f6b114af1a794e3
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crostestutils/+/5754043
Reviewed-by: Puthikorn Voravootivat <[email protected]>
Tested-by: Bart Meder <[email protected]>
Auto-Submit: Bart Meder <[email protected]>
Reviewed-by: Sean Carpenter <[email protected]>
Commit-Queue: Bart Meder <[email protected]>
1 file changed