Updated code to adhere to ADR018 (#180)

## Description

This contains a breaking change, since the version that is specified for HDFS now has to include a stackable image version.

Previously the version could be specified as "version: 3.2.1" and the operator simply added the stackable version to this. But going forward we have decided that the image version has to be explictly specified, so it will now have to be "version: 3.2.1-stackable-0.1.0" or similar.

This is in accordance with ADR18 (https://docs.stackable.tech/home/contributor/adr/ADR018-product_image_versioning.html).

*Please add a description here. This will become the commit message of the merge request later.*

Author: soenkeliebau

CHANGELOG.md

@@ -20,6 +20,8 @@ All notable changes to this project will be documented in this file.
 
 - `operator-rs` `0.10.0` -> `0.15.0` ([#130], [#134], [#148]).
 - `HADOOP_OPTS` for jmx exporter specified to `HADOOP_NAMENODE_OPTS`, `HADOOP_DATANODE_OPTS` and `HADOOP_JOURNALNODE_OPTS` to fix cli tool ([#148]).
+- [BREAKING] Specifying the product version has been changed to adhere to [ADR018](https://docs.stackable.tech/home/contributor/adr/ADR018-product_image_versioning.html) instead of just specifying the product version you will now have to add the Stackable image version as well, so `version: 3.5.8` becomes (for example) `version: 3.5.8-stackable0.1.0` ([#180])
+
 
 [#122]: https://github.com/stackabletech/hdfs-operator/pull/122
 [#130]: https://github.com/stackabletech/hdfs-operator/pull/130
@@ -28,6 +30,7 @@ All notable changes to this project will be documented in this file.
 [#150]: https://github.com/stackabletech/hdfs-operator/pull/150
 [#162]: https://github.com/stackabletech/hdfs-operator/pull/162
 [#164]: https://github.com/stackabletech/hdfs-operator/pull/164
+[#180]: https://github.com/stackabletech/hdfs-operator/pull/180
 
 ## [0.3.0] - 2022-02-14
 

docs/modules/ROOT/pages/usage.adoc

@@ -13,7 +13,7 @@ kind: ZookeeperCluster
 metadata:
   name: simple-zk
 spec:
-  version: 3.5.8
+  version: 3.5.8-stackable0.7.0
   servers:
     roleGroups:
       default:
@@ -31,7 +31,11 @@ spec:
 EOF
 ----
 
-Once a Zookeeper cluster and the operator are up and running, you can create an  Apache HDFS (v3.2.2) cluster like this:
+Once a Zookeeper cluster and the operator are up and running, you can create an Apache HDFS cluster like shown below.
+Please note that the version you need to specify is not only the version of Hadoop which you want to roll out, but has to be amended with a Stackable version as shown.
+This Stackable version is the version of the underlying container image which is used to execute the processes.
+For a list of available versions please check our https://repo.stackable.tech/#browse/browse:docker:v2%2Fstackable%2Fhadoop%2Ftags[image registry].
+It should generally be safe to simply use the latest image version that is available.
 
 [source,bash]
 ----
@@ -41,7 +45,7 @@ kind: HdfsCluster
 metadata:
   name: simple
 spec:
-  version: 3.2.2
+  version: 3.2.2-stackable0.5.0
   zookeeperConfigMapName: simple-znode
   dfsReplication: 3
   log4j: |-

examples/simple-hdfs-cluster.yaml

@@ -4,7 +4,7 @@ kind: ZookeeperCluster
 metadata:
   name: simple-zk
 spec:
-  version: 3.5.8
+  version: 3.5.8-stackable0.7.0
   servers:
     roleGroups:
       default:
@@ -27,7 +27,7 @@ kind: HdfsCluster
 metadata:
   name: simple-hdfs
 spec:
-  version: 3.2.2
+  version: 3.2.2-stackable0.5.0
   zookeeperConfigMapName: simple-hdfs-znode
   dfsReplication: 3
   log4j: |-

rust/crd/src/lib.rs

@@ -166,7 +166,7 @@ impl HdfsCluster {
 
     pub fn hdfs_image(&self) -> HdfsOperatorResult<String> {
         Ok(format!(
-            "docker.stackable.tech/stackable/hadoop:{}-stackable0",
+            "docker.stackable.tech/stackable/hadoop:{}",
             self.hdfs_version()?
         ))
     }

tests/test-definition.yaml

@@ -2,10 +2,10 @@
 dimensions:
   - name: hadoop
     values:
-      - 3.2.2
+      - 3.2.2-stackable0.5.0
   - name: zookeeper
     values:
-      - 3.5.8
+      - 3.5.8-stackable0.7.0
 tests:
   - name: fs-ops
     dimensions: