[plaso] Add an option to write pinfo.py output to a file

[plaso] Add an option to write pinfo.py output to a file

I'll need the options for e2e tests purposes.

[Joachim Metz, 2017-06-28 19:08:22]

I opt to merge these changes after https://codereview.appspot.com/326740043/

[romaing, 2017-08-03 15:57:52]

On 2017/06/28 19:08:22, Joachim Metz wrote:
> I opt to merge these changes after https://codereview.appspot.com/326740043/

Ping! 326740043 has been merged =)

[Joachim Metz, 2017-08-03 17:23:56]

thx for the reminder where is the github PR for this (automated tests) and can
you

git fetch upstream && git pull --rebase upstream master

[romaing, 2017-08-04 09:23:46]

Code updated.

[romaing, 2017-08-04 09:25:35]

On 2017/08/03 17:23:56, Joachim Metz wrote:
> thx for the reminder where is the github PR for this (automated tests) and can
> you
> 
> git fetch upstream && git pull --rebase upstream master

Fixed

[Joachim Metz, 2017-08-04 12:05:40]

LGTM

[romaing, 2017-08-04 12:36:50]

Changes have been merged with master branch. To close the review and clean up
the feature branch you can run: python ./utils/review.py close output-for-pinfo