Enhance the Term TDTM logic to update Course Offering dates when Term dates are updated in more scenarios

[robertbwatson]

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• Do you want to request a feature or report a bug?
  Feature/Enhancement

• What is the current behavior?
  When a Term's Start and/or End Date is updated, the new values are only copied down to the child Course Offering(s) when:

1. The Term Start Date or End Date was previously blank, and
2. The Course Offering Start Date or End Date is currently blank

• What is the expected behavior?
  It would be an improvement if EDA also looks at changes to the Term's Start and/or End Dates when the date(s) are being changed from one value to another value (for example, the term might now end on June 24th instead of June 22nd because of a prior weather emergency)

In this instance, EDA would look for Course Offering(s) where the Start Date and End Date matches the previous values of the Term and updates them to match the new values of the Term.

• What is the motivation / use case for changing the behavior?
  Data integrity