[9.0][FIX]account voucher. Delete inherited views first

[AaronHForgeFlow]

Description of the issue/feature this PR addresses: There may exist some custom modules that inherits from the account.voucher.payment views

Current behavior before PR: Tried to migrate a database with a custom module that inherits a view from account.voucher.payment. Constraint Error when executing the query that deletes the view because there are some other views that inherit the original one.

Desired behavior after PR is merged: Delete all the views for account.voucher.payment. First, the inherited ones and then the standard ones.

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[MiquelRForgeFlow]

Perfect! 👍

[mvaled]

I think this is special case of #594. Don't you think we should provide a general solution?

[pedrobaeza]

I don't see why is this needed. Using correctly openupgradelib's update_module_names method with the merge_modules=True argument, you can lead perfectly with dangling views on a missing module, as Odoo update process remove them.

[AaronHForgeFlow]

All right @pedrobaeza Closing this 😥