HOTFIX: Increase time limit for Bagel test

The test was timing out on some slow EC2 workers.

Author: Ankur Dave <ankurdave@gmail.com>

Closes #1037 from ankurdave/bagel-test-time-limit and squashes the following commits:

67fd487 [Ankur Dave] Increase time limit for Bagel test
(cherry picked from commit 55a0e87ee4655106d5e0ed799b11e77f68a17dbb)

Signed-off-by: Patrick Wendell <pwendell@gmail.com>