**/*.py: use /usr/bin/env to find python

**/*.py: use /usr/bin/env to find python

Don't hardcode /usr/bin/python, as many users may have it pointing to
python3.  It is simpler to ask users to make sure that `/usr/bin/env
python` picks up the right version of python.

Also fix trivial whitespace errors caught by presumbit script.

BUG=none
TEST=all tests pass

[Ramkumar Ramachandra, 2013-03-14 09:33:32]

Hi,

Could you please review this simple change?  I use Arch Linux, and the
/usr/bin/python points to Python3.  I installed Python2 and symlinked
~/bin/python to it, hoping for it to be picked up by the scripts.

Thanks.

[khim, 2013-03-14 10:36:52]

Hmm... This change is explicitly forbidden by a style guide:
http://google-styleguide.googlecode.com/svn/trunk/pyguide.html#Shebang_Line

This automatically moves this change from "simple change" bucket to "we need to
think long and hard about it" bucket.
I understand the rationale but still I don't like to introduce
yet-another-difference between standard Google's style and NaCl style.

[artagnon_gmail.com, 2013-03-14 17:29:10]

<khim@chromium.org> wrote:
> Hmm... This change is explicitly forbidden by a style guide:
> http://google-styleguide.googlecode.com/svn/trunk/pyguide.html#Shebang_Line

Are you sure you're not taking the style guide too literally?  It's
simply stating that you need a line to tell the kernel where to find
the Python interpreter.  I submitted a similar change to the
pnaclports project, and have already got a LGTM on it [1].

[1]: https://codereview.chromium.org/12412021/

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