[12.0][FIX] base: add remove_tables_fks

[MiquelRForgeFlow]

I wanted to do it several days ago, and now I make it before going to lunch =P

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[pedrobaeza]

Shouldn't this be on stock module instead?

[MiquelRForgeFlow]

Why? It just happens it's only one table, related to stock, but there could be more tables and ones unrelated to stock. If in the future we want to add more tables, for example, many2many tables, then it will be easy to add them in this method instead of add again the method. It's the same done in 565ab92, that later was filled with ddb89a8.

[pedrobaeza]

Yeah, there are 2 conflicting goals here:

• Have all obsolete models in the same place.
• Reduce noise in the log. I'm analyzing the openupgradelib method and indeed there's no noise if the module is not installed, so OK to put it here.