MDL-45237 report_loglive: prevent debug warnings

The use of $PAGE necessitates the $PAGE params to be set. Really
the url shouldn't be necessary for this scenario as its enforced for
things like redirects. But this is the quick fix to keep our logs
clean.
MDL-45362 Availability: Behat test fails on first of month
MDL-44729 theme_bootstrapbase: override the maintenance renderer

This patch overrides the maintenance renderer in the bootstrapbase
theme in order to override the notification method in the same way
we override the core renderer notification method.
This ensures now that clean is standard that notifications during
maintenance tasks (install, upgrade etc) look pretty.
Merge branch '44729-27' of git://github.com/samhemelryk/moodle
Merge branch 'MDL-45362-master' of https://github.com/sammarshallou/moodle
Merge branch 'MDL-45237-master' of git://github.com/danpoltawski/moodle
MDL-45314 core_grade: a JS fix for the grader report