MDL-44711 block_navigation: fixed typo in behat tests
Merge branch '44711-28-r2' of git://github.com/samhemelryk/moodle
MDL-45294 behat: Supporting an aria-label as a block ref
MDL-45294 behat: Updating block references to aria label value

Also improving moodle selectors xpath expressions
readability.
MDL-45320 behat: Step definitions for blocks
MDL-45320 block_html: behat tests
MDL-45320 behat: change to block selector