expire the home menu html cache after 15 minutes
expire the home menu html cache after 15 minutes

This means there may be a delay of up to 15 minutes between when a course
starts and when it shows up in the dropdown for a student. This will be fixed
when we have a central cache and better invalidation.

Change-Id: I377a22609963979ade9fae7e0ced4b7c2c48a368
Reviewed-on: https://gerrit.instructure.com/5315
Tested-by: Hudson <dfb64870173313a9a7b56f814c8e3b33e268497a@instructure.com>
Reviewed-by: Brian Palmer <3cb4e1df5ec4da2c7c4af7c52cec8cf340a55a10@instructure.com>
Reviewed-by: Cody Cutrer <c4fe2b1d90ef8f2548c8aeabfa633434316f0305@instructure.com>

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