Fix tests: Allow absolute paths for config file option (reapplies #253)
Fix tests: Allow absolute paths for config file option (reapplies #253)

ember-cli-deploy/ember-cli-deploy,LevelbossMike/ember-cli-deploy,duizendnegen/ember-cli-deploy,duizendnegen/ember-cli-deploy,ember-cli/ember-cli-deploy,achambers/ember-cli-deploy,ember-cli-deploy/ember-cli-deploy,LevelbossMike/ember-cli-deploy,achambers/ember-cli-deploy,ember-cli/ember-cli-deploy,ember-cli/ember-cli-deploy,ember-cli-deploy/ember-cli-deploy