Superevent manager should not record error messages for unhandled LVAlert messages
The superevent manager records a CRITICAL log entry for every single unhandled LVAlert message, even for ordinary GraceDb log messages. This clutters up the log files and Sentry. It should be an INFO or DEBUG message at most.
See https://emfollow.ligo.caltech.edu/sentry/gwcelery/issues/121/.