Add glassfish LOGLEVELS

[kallisti5]

https://docs.oracle.com/cd/E19316-01/820-4339/6nfqftsng/index.html

https://github.com/logstash-plugins/logstash-patterns-core/blob/master/patterns/grok-patterns#L95

FINEST, FINER, FINE, CONFIG missing.

An alternative is adding a "JAVALOGLEVELS" ?

[kares]

thanks, I believe having JAVALOGLEVEL (?:FINEST|FINER|...) would be best if anyone wants to approach this one with a PR.