Group all .update() and .update_definition() calls in fixes

[jacobdadams]

Most fixes use either item.update() or manager.update_definition() calls to perform the actual fix. Create a helper method that allows the object to build a list of fixes and then gets called after all the _fix methods have been run to perform the actual fixes.

This allows us to reduce the number of REST calls per item, hopefully reducing the time to run.

The creation process should include some informal time profiling to verify time savings.