UI tests: new "Learn more" link in JS Tracking code generator https://github.com/piwik/piwik/issues/9932

New unit test ensuring that JS SDK getCookieName depends on website ID refs https://github.com/piwik/piwik/issues/9932

`setDomains("example.com/index*")` will correctly not track an outlink request to for example.com/index.html or example.com/index_en.html

refs #9932

Instead, we will better document how to correctly set the cookie configuration. https://github.com/piwik/piwik/issues/9932

UI tests: Fixed z-index issues + new UI test for metric tooltip https://github.com/piwik/piwik/issues/9868

Prefix DB field by the table alias, to prevent error when a segment joins another table that has some field names in common #9822

fixing this integration test: https://travis-ci.org/piwik/piwik/jobs/108227278