Give release builds more time.

Lets see if this removes the flake on the bots seen in sky tests. In
local testing it looks like sky_server's CherryPy becomes overloaded and
then the requests take a very long time to complete which makes the tests
timeout. I increased the timeout locally and it made the tests start
passing consistently when using high --repeat values.

R=ojan@chromium.org

Review URL: https://codereview.chromium.org/741603002