MQE-2110: MFTF command to pause test execution

[jilu1]

Description

Fixed Issues (if relevant)

1. magento/magento2-functional-testing-framework#: 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 78cd6470ad3bd58efb3f24a8ec05347074b7eb2c on MQE-2110 into a8436668d98165eec098f88fb0b2ad1d5e3574a8 on develop.