Ignore addresses when country is not authorized

[luigifab]

Description

This PR hide not allowed countries when you create an order from backend.

Manual testing scenarios

• For default configuration allow some countries
• Create a customer and create multiple adresses (one per country)
• For one of your store, update store configuration, allow one country
• Try to create an order from backend with this customer with previous store
• Without the PR: all adresses are visible, and with the PR: only addresses for allowed countries are displayed

Contribution checklist

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All automated tests passed successfully (all builds are green)
• Add yourself to contributors list

[fballiano]

I'd rebase this PR to 20.0

[luigifab]

If you want... I'm lost with 19 and 20 branches.

[fballiano]

OpenMage/rfcs#7 will be approved soon I hope so v19 will become frozen :-)