Fix gsutil execution on Windows.

Fix gsutil execution on Windows.

5498b95831de0711fda19f2aabac4645ffb6cc78 runs gsutil using 'os.execv',
which, on Windows, apparently causes it to return before completion.

Also add verbosity to '7z' failures on toolchain downloading.

BUG=chromium:445425
TEST=bot
  - Ran on bot, this fix solves the problem that we were seeing.

R=pgervais@chromium.org, sergeyberezin@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=293507

[dnj, 2014-12-29 19:43:36]

dnj@chromium.org changed reviewers:
+ pgervais@chromium.org, sergeyberezin@chromium.org

[dnj, 2014-12-29 19:43:36]

PTAL

[Sergey Berezin, 2014-12-29 19:46:41]

lgtm

[pgervais, 2014-12-29 19:46:59]

lgtm with one nit. Up to you to fix it or not.

https://chromiumcodereview.appspot.com/828463003/diff/1/gsutil.py
File gsutil.py (right):

https://chromiumcodereview.appspot.com/828463003/diff/1/gsutil.py#newcode133
gsutil.py:133: os.exit(e.code)
Use return (e.code) instead and use the sys.exit in the last line of this file?

https://chromiumcodereview.appspot.com/828463003/diff/1/gsutil.py#newcode153
gsutil.py:153: run_gsutil(force_version, fallback, target, args)
Use 'return run_gsutil(...)' instead.

[dnj (Google), 2014-12-29 19:48:44]

dnj@google.com changed reviewers:
+ dnj@google.com

[dnj (Google), 2014-12-29 19:48:45]

https://chromiumcodereview.appspot.com/828463003/diff/1/gsutil.py
File gsutil.py (right):

https://chromiumcodereview.appspot.com/828463003/diff/1/gsutil.py#newcode133
gsutil.py:133: os.exit(e.code)
On 2014/12/29 19:46:59, pgervais wrote:
> Use return (e.code) instead and use the sys.exit in the last line of this
file?

Done.

[dnj, 2014-12-29 19:50:05]

Committed patchset #2 (id:20001) manually as 293507.