Fix RELEASE and VERSION labels in product images

[maltesander]

Our docker images currently have a hard coded label RELEASE=1 which was required for Openshift certification. Another label is VERSION which currently is set from the product version (e.g. 3.8.0 for a ZooKeeper 3.8.0).

For RELEASE we want to update to our actual naming of our releases. The next one would be 22.09. This should probably be parameterized in the build script instead of each product image.

The version label does not make sense currently. It will always be 3.8.0 (for a ZooKeeper 3.8.0) even if we adapt, add to or change that image.

The VERSION label should become the full tag we create from that image like zookeeper3.8.0-stackable0.1.0 to clearly identify the image.

This is done when:

• The RELEASE label is set "globally" via a CLI parameter in the build script
• The VERSION label is set to the actually name of the created docker images like zookeeper3.8.0-stackable0.1.0