- Removed yum update, it should be provided from the basebox image
- Added configuration template for opennms-datasource.xml for OpenNMS and
  instead of setting postgress to trust, provide a postgres user
  password and use it in the opennms-datasource.xml
- Added opennms.config with deactived START_TIMEOUT and set Java heap
  size
- Added command set Java environment for OpenNMS and install the
  database
- Added rule for iptables to allow 8980/TCP for OpenNMS WebUI
- Parameter for OpenNMS release to be able to easily install
  stable/testing/snapshot/bleeding