Jira crashed due to too many open files

[glorang]

For the first time in years one of our Jira instances crashed due to "too many open files". We have increased the limit as documented to the recommended 8k.

After some short debugging it looks like RemoteUserJiraAuth.properties was at fault here:

# lsof -u jira |grep RemoteUserJiraAuth.properties |wc -l
7204

I'm not sure this was really the root cause or something else broke before/somewhere else, but as the fix is so simple I'll shoot in a pull request in a minute.