Setup - default to Elastic

[dougburks]

• securityonion-setup package should depend on securityonion-elastic to force installation
• rename sosetup to sosetup-elsa
• add note to sosetup-elsa that ELSA will reach EOL soon
• symlink sosetup --> sosetup-elastic
• update sosetup.conf with new settings
• verify that re-running Setup on sensor does not duplicate settings in elasticsearch.yml

[dougburks]

submitted for testing:
https://groups.google.com/d/topic/security-onion-testing/JhsdpXEyyic/discussion

[dougburks]

Published:
https://blog.securityonion.net/2018/04/securityonion-setup-20120912.html