Quick hive script for populating a hive table with pageload information for brainworkout pages

Test Plan: Earlier script where condition was "url LIKE "%brainworkout%" made a nonempty table as expected, but included other urls like "/brainworkout.css", so I changed the condition to "url LIKE "/brainworkout_%". Hopefully this works :)

Reviewers: jace, jascha

Differential Revision: http://phabricator.khanacademy.org/D3088
Select by equality rather than by "LIKE"

Test Plan: Queried existing table, which has the desired brainworkou1/2 pageloadds as well as extraneous rows, for those where url is 'brainworkout_1' or 'brainworkout_2', got back the desired rows.
Response to review

Fixed strange incorrect changes that somehow snuck in

Test Plan: Ran this hive script successfully