Merge branch 'install_37_STABLE' of https://git.in.moodle.com/amosbot/moodle-install into MOODLE_37_STABLE

The behat hooks were needlessly complicated which made them much harder
to read, and understand, leading to bugs during development.

These have been significantly simplified to favour clarity over
overloading.

The session was previously only started once, but has now been moved to
restart between each test. Because of this the `$session->start()` is
now called more frequently which exposes a pre-existing issue whereby
Selenium will periodically fail to start.

When the session was only started at the beginning of the test, and at
occasional other times, it made sense to always stop the test runner
because it signified an issue with obtaining the session at all.

Since the session is restarted more frequently, and now between every
test, it no longer makes sense to do this. The test should only be
_stopped_ if the first attempt to obtain the Session fails. Once a
Session has been retrieved at least once it no longer makes sense to
assume that the failure was a configuration failure, but a connection
failure. Therefore subsequent tests should be attempted.

The maximum paths length is now consistent with the YUI loader.
This fix also removes any duplicate paths, so each file is only ever
fetched once.

Merge branch 'm37_MDL-66322_Travis_Run_Using_Docker_ExtTests' of https://github.com/scara/moodle into MOODLE_37_STABLE

Merge branch 'install_37_STABLE' of https://git.in.moodle.com/amosbot/moodle-install into MOODLE_37_STABLE

This is no longer required as the Mink session is restarted after every
test regardless.

This is now done for all scenarios. It is no longer necessary to do so
specifically for mod_scorm.