MQE-2110: MFTF command to pause test execution

[jilu1]

Description

Fixed Issues (if relevant)

1. magento/magento2-functional-testing-framework#<issue_number>: Issue title
2. ...

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/verification tests (if applicable)
• All automated tests passed successfully (all builds on Travis CI are green)
• Changes to Framework doesn't have backward incompatible changes for tests or have related Pull Request with fixes to tests

[jilu1]

@soumyau @dobooth Some texts and a link fix. Please review.

[coveralls]

Coverage remained the same at 61.328% when pulling 78cd647 on MQE-2110 into a843666 on develop.