MDL-42625 behat: Wrapping select an option extra actions in a try & catch

To select an option is specially painful, every browser
behaves differently and phantomjs just joined the party
throwing "Element does not exist in cache" random
exceptions that we need to catch.
MDL-33925: auth_imap: add self-signed cert support
Automatically generated installer lang files
Merge branch 'install_master' of git://git.moodle.org/moodle-install
weekly release 2.7dev
MDL-43213 try to simplify behat config and init code

1/ always require 3 behat settings - $CFG->behat_wwwroot, $CFG->behat_dataroot and $CFG->behat_prefix
2/ cleanup init code
3/ do not require $CFG->wwwroot and $CFG->dataroot on test sites
4/ remove switch completely - the most confusing part for me
5/ print out behat_wwwwroot in init script so that you can test the test site manually
MDL-43235 behat: Ensure that behat_config_manager::get_config_file_contents() has always a behat_wwwroot