Change the display name of the my overview block to Course overview to
match the block it is replacing (and the UX prototype).

The use of "My" is no longer recommended when naming things in Moodle.

Simey Lameze authored Mar 15, 2017 and Damyon Wiese committed Apr 03, 2017

Also remove few more unnecessary steps that redirects behat to
site home page to actually get to the course.

Part of MDL-55611 epic.