fromupstream: support multiple '-t' args

It's nice to spell out multiple TEST= lines sometimes.

BUG=none
TEST=`fromupstream.py -t foo [...]` and
     `fromupstream.py -t test1 -t test2 [...]`

Change-Id: I2903322271ff9f88cafa747194f7a33cfa1be93c
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/dev-util/+/2367223
Tested-by: Brian Norris <briannorris@chromium.org>
Reviewed-by: Tzung-Bi Shih <tzungbi@chromium.org>
Commit-Queue: Tzung-Bi Shih <tzungbi@chromium.org>
1 file changed