This PR completely removes the puppet/staging module dependancy
This will break things for anyone using deploy_module => 'staging', so a major version bump is proposed.
Adds support for Amazon linux 2018. The default behavior attempts to use systemd and fails.
There is no issue associated with this PR
This integrates the setenv.sh java parameter changes of Confluence 7.12, see this: https://confluence.atlassian.com/doc/confluence-7-12-upgrade-notes-1044092469.html#Confluence7.12UpgradeNotes-setenvfileimprovements
It allows to set parameters depending on the java version, similar like it was done in the puppet-jira module. Also it allows to set options for bigger instances as recommended on the same article linked above.