Make JIRA an easy target for OOM killer

Eggplant occasionally dies with OOM situation. This just happened
this morning, and looking at syslog, I see that the OOM killer failed
to kill the real memory leak culprit, which is either JIRA or
Confluence.

This change will make it an easy target for killing, to prevent
system instability that prevents us from logging in.
This experience has stalled. Making way for more incremental approach.
adding small part of current Confluence setup into Puppet
Adjusting oom_adj to make it a target for OOM killer

We want Confluence (& JIRA) to die before any other daemons are touched.