switch python default to 3

BUG=chromium:1024144
TEST=CQ passes

Change-Id: Ib4b634cb57154b5b3d21ebf39fbf506b1d6cb897
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosutils/+/1914040
Tested-by: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Chris McDonald <cjmcdonald@chromium.org>
2 files changed