Add confirmation and lock_expires to customer export csv - Fix issue 10765

[convenient]

Description

Port of #10915 to the from the develop branch to the 2.2-develop branch.

Add confirmation and lock_expires to customer export csv.

Fixed Issues (if relevant)

#10765 (A SQUASHTOBERFEST issue)

Manual testing scenarios

1. Ensure at least one customer exists in your database
2. login to admin panel
3. Add the "Account lock" and "Confirmed Email" columns to your customer grid
4. Click on export button to export details in CSV format.
5. See these fields being populated with values, previously they were null.

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)

[convenient]

So close!

I guess you're having a few errors with travis?

Configuration: /home/travis/build/magento/magento2/dev/tests/functional/phpunit.xml
................
The job exceeded the maximum time limit for jobs, and has been terminated.