ticket description not 100% up-to-date, see comments

Move the automagic logout on PageObjects#login, to a better suited place, such as an "after-each" callback on Selenium extension, so that it does not interfere with login logic. Making sure that the next test gets a new session.

Additional context: the reason for automatic logout is because we already recycle the WebDriver instance between test-cases.

Additional task: before re-introducing the logout in Selenium extension, verify via VNC if two consequent tests are presented with the login screen (despite no explicit logout).