Behat: Review peer_assessment.feature and confirm coverage

[Rebecca Blundell]

The regression spreadsheet has the following test:

Peers can perform a blind review of a portfolio authors skills and competencies when the “Peer assessment” block is on a page. They are not able to see any content of the person they are assessing. Peer assessments can be saved as drafts before making them available to the portfolio author and others

More info about new functionality found here
https://bugs.launchpad.net/mahara/+bug/1784778
https://bugs.launchpad.net/mahara/+bug/1784781

Please review /user_content/peer_assessment.feature and see whether the above functionality is covered.
1. Update this bug with any changes that need to be made.
2. Update the spreadsheet with AT coverage.