Add more flexible form and field spport in LocalSiteAwareModelFormMixin.
Review Request #1670 — Created June 7, 2019 and updated
`LocalSiteAwareModelFormMixin` has been updated to work with a wider variety of forms. Specifically, those that take in a `request` parameter, which previously was not being passed in to the parent form. Since there's no reliable way to introspect whether the parent requires this parameter, and since the mixin itself needs it, we now have a flag that the form can set to specify it needs this parameter. This will be required for the `IntegrationConfigForm` in a future change. This also improves the field support. `ConditionField`s are now supported, and will have their `LocalSite` set in order to limit valid results to those on the selected site. On top of this, the logic for overriding and then restoring the queryset on fields has been expanded to do the same with the `local_site_name` attribute on a field's `RelatedUserWidget`, ensuring everything is back to normal after validation if not limiting the form to a `LocalSite`. Testing Done: Unit tests pass, both as of this change and with the upcoming work to move `IntegrationConfigForm` over to this mixin. Manually tested the forms with this mixin. Reviewed at https://reviews.reviewboard.org/r/10409/
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