Revert "[1.5.x] Silenced last sporadic failure on 1.5."

This reverts commit 6a708cd6.

Reverted since it only moved the failures to some other tests and it apperently
only worked by accident. Patched selenium for now to include:
https://github.com/SeleniumHQ/selenium/pull/118
which seems to be the root cause for sporadic extra requests to the live server,
which then cause all sorts of issues.