Configure max times in forms

[jaguillette]

Within the local directory, in the per-course form.yml files, we should be customizing the max duration available to sessions, similar to what's done in other apps. The section doing this, under the attributes key in the yml file, looks like this:

  # How long will the job run for? Configure min, max, and step to set limits 
  # on how long app sessions can run.
  bc_num_hours:
    value: 2
    min: 1
    max: 6  # 6 hours max
    step: 1

Each config file under local should get a consistent config similar to this one for bc_num_hours to limit the amount of time a session can be requested to 6 hours max.