Frank Zhang a68a8ea830 Add retries for horizon venv download
Previous horizon attempt download venv from repo without retries.
This would simply fail when common HTTP 503 happens. This patch
will give more deplay and chance to let download go through.

Change-Id: I0c38d23c9981e1cc92a12bcf5bff34edd9828a0b
Closes-Bug: 1661374
2017-02-03 10:41:55 -06:00
..
2017-01-10 15:26:28 +00:00