Release 1.2.0

This is a major release and includes the following updates:

• operator-conf ConfigMap is used to store operator templates
• bug fixes
• capture Postgres Full Version for databases and clusters
• support --version command option for pgo show database and pgo show cluster to filter results based on Postgres Full Version
• removed database concept in favor of just a cluster which can have 0 or more replicas, much cleaner and supports more features in the future
• replaced clear text passwords with secrets which get generated for each cluster
• changed CLI command, to update a cluster, you run 'pgo update mycluster'
• changed CLI command, to backup a cluster, you run 'pgo backup mycluster'
• for command 'pgo show pvc', added a flag called '--pvc-root' which lets you specify where in the PVC you want the listing to be based on, if not specified, the value defaults to '/'
• added better CLI error messages
• fixed a bug in 'pgo show pvc' where logs were not being displayed
• added a status field to the backup TPR, that field is marked complete when the backup job is finished
• add '--ccp-image-tag' command flag for 'pgo create cluster' and 'pgo update' commands, this allows users to override the config file setting
• add scaling command, 'pgo scale mycluster --replica-count=2' will scale up or down the replicas