Move Behat tests to new admin module

[chillu]

We've moved all the underlying functionality into the new admin module, but kept Behat in framework. Which is an issue since we're not running those tests at the point when new code is added (PRs to admin module)

We could keep login.feature in framework, although would need to change the target url (admin/ won't exist). lostpassword.feature can stay as well

[chillu]

Confirmed this is still the case: https://github.com/silverstripe/silverstripe-framework/tree/master/tests/behat

[robbieaverill]

This was done recently in #8112, but we're now seeing test failures in silverstripe/admin that are caused by and testing changes in framework. I vote for moving the login and security related tests back into framework from admin

[chillu]

Agreed, can you create a ticket and move it to our backlog, @robbieaverill?

[robbieaverill]

Sure. This issue itself is done, so I'll close it

[robbieaverill]

Logged as #8256