[Backport] FIX for apparently random API failures while using array types

[ronak2ram]

Original Pull Request

#16137

Description

Magento2 web-api is based on the Interface doctype, but if the developer is using CR+LF end-of-line, the \Magento\Framework\Reflection\TypeProcessor class is not able to determine the class name on array types.

This was caused by a wrong regex non including \r in \Magento\Framework\Reflection\TypeProcessor::getParamType.

Additional note: Magento 2.2-develop seems to be not affected by this.

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)

[magento-engcom-team]

Hi @ronak2ram. Thank you for your contribution.
We will aim to release these changes as part of 2.1.15.
Please check the release notes for final confirmation.