Remove old housekeeper from backend.
Add schema update for housekeeping table changes.
Make sure housekeeping run times are in UTC.
Add housekeeping task for hardware profiler (smolt).

This adds a housekeeping task to allow the hardware profiler to be run
periodically through the housekeeper, rather than a single check
performed during frontend startup. This also adds a schema update to
reorganize a few settings related to it.
Add missing header changes for HardwareProfileTask.
Add HardwareProfile task to assorted applications.

This replaces the initial HardwareProfile startup check in mythfrontend
with the new task run through the housekeeper, and adds the check to
mythbackend and mythjobqueue as well.