Eliminate usage of Zend_Config from Magento 2 Open Source #71

[knowj]

Remove all references of Zend_Config

Removed all instances/references to Zend_Config within the Magento 2 core. The approach with this is to inherit the docblocks in the files where it still exists.

The complete removal of the project dependency on Zend Framework 1 will require the removal of Zend_Validate which is currently in PR: https://github.com/magento-engcom/php-7.2-support/issues/82

The changes here aren't reflected in issue 82

Description

Remove import of Zend_Config in oAuth keylength validator and inherit previously copy/pasted Docblock Import previously copy/pasted docblock from email address validator

Fixed Issues (if relevant)

1. magento-engcom/php-7.2-support#71: Eliminate usage of Zend_Config from Magento 2 Open Source #71

Manual testing scenarios

No functionality changed import of Zend_Config was purely for usage in Docblock

Contribution checklist

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

[bbatsche]

Single build failure in Travis is not related to this change and should be merged anyways