MAGETWO-70390 selection can change qty

[adam-paterson]

Provides support for selection_can_change_qty during import and export

Description

Adds bundle selection properties for use during import and export.

Fixed Issues (if relevant)

1. BundleImportExport is missing selection_can_change_qty magento/magento2#9342 (BundleImportExport is missing selection_can_change_qty #41 )

Manual testing scenarios

1. Create Simple products to assign to bundle.
2. Create Bundled products and assign simples as options.
3. Export via Import/Export. {{bundle_values}} column should have a property for {{can_change_qty}} which matches the value in for the option in the admin.
4. Change the value of {{can_change_qty}} and import using the Add/Replace method. Bundle option should change the "User Defined" checkbox in the admin.

Contribution checklist

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• All automated tests passed successfully (all builds on Travis CI are green)

[dmanners]

Hey @adam-paterson thanks for this. The code looks ok for me at the moment but I see there are a few failing unit and integration tests in the travis build.

Would you be able to have a look at these?

Thanks

[magento-engcom-team]

@adam-paterson thank you for contributing. Please accept Community Contributors team invitation here to gain extended permissions for this repository.

[adam-paterson]

@magento-engcom-team Accepted 👍