2021 updates

• moved to Ulm University Gitlab
• migrated to terraform 1.0.0
• migrated to ubuntu 20.04
• minor terraform improvements
• configurable openstack (OmiStack/bwCloud)
• updated intro slides w/ new screenshots

Mediawiki

• php7
• mediawiki 1.37
• new database initialization
• improved load balancer

Spark

• openjdk8
• wordcount example inline
• created spark event structure