[teleirc] ignore failures from yarn because of bad exit codes
[teleirc] ignore failures from yarn because of bad exit codes

This commit ignores failures from `yarn install`. When `yarn` runs, even
if it is successful, an optional dependency with no effect on Teleirc
fails in some environments. This ensures Ansible keeps plugging along
even when the success with bad exit codes happens.

jflory7/infrastructure,jflory7/infrastructure