M2 5381

[tzyganu]

Description

This PR solves the issue #5381

Fixed Issues (if relevant)

1. Cannot create a etc/view.xml file with an images tag with an attribute module other than Magento_Catalog #5381:Cannot create a etc/view.xml file with an images tag with an attribute module other than Magento_Catalog
2. This PR modifies lib/internal/Magento/Framework/Config/etc/view.xsd and allows multiple imageType nodes inside view.xml files.
3. This PR adds the member var imageBuilder that was not declared in Magento\Catalog\Block\Product\AbstractProduct

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)