Before generating burn in multiversion tasks, we assert that the number of tests defined in etc/evergreen.yml that have the MULTIVERSION_TAG equals the number of yaml suite files (living in buildscripts/resmokeconfig/suites) with the BURN_IN_CONFIG_KEY.

get_named_suites_with_root_level_and_key is a helper function that requires the config values to be populated before being called. We should make sure we have called buildscripts.resmokelib.parser.set_options() before we ever make any calls to this helper.