MDL-44359 fix explode(', ', regressions from MDL-44255
MDL-43236 behat: Deprecate old steps

Correcting grammar errors and deprecating
the previous steps definitions:
- behat_data_generators::the_following_exists()
- behat_general::should_exists()
- behat_general::should_not_exists()
MDL-43236 behat: Updating references to deprecated methods
MDL-43236 behat: Step arguments normalization

Updating step definitions arguments according to the
documentation page.
Merge branch 'MDL-43236_master' of git://github.com/dmonllao/moodle
MDL-44440 behat: Changing , for > as a navigation tree nodes separator

Using greater than as seems a more natural separator
than the comma when separating nodes which have a
hierarchy relation.
Merge branch 'MDL-44440_master' of git://github.com/dmonllao/moodle
MDL-44017 Events: Deprecated content_viewed event

Replaced content_viewed event with appropriate events and deprecated
content_viewed event
MDL-43682 report_loglive Add renderers
MDL-43682 report_loglive Rewrite loglive reports to use new logging apis
MDL-43682 report_loglive Add ajax support for updating livelogs tagle
MDL-43682 report_loglive write behat tests for loglive
MDL-43682 report_loglive: Code cleanup and add proper todos