Add code changes to enable rack awareness features in Hdfs clusters

[soenkeliebau]

Description

fixes #325

Definition of Done Checklist

• Not all of these items are applicable to all PRs, the author should update this template to only leave the boxes in that are relevant
• Please make sure all these things are done and tick the boxes

# Author - [x] Changes are OpenShift compatible (tested on OKD 4.15) - [x] CRD changes approved - [x] Helm chart can be installed and deployed operator works - [x] Integration tests passed (for non trivial changes) 

# Reviewer - [x] Code contains useful comments - [x] (Integration-)Test cases added - [x] Documentation added or updated - [x] Changelog updated - [x] Cargo.toml only contains references to git tags (not specific commits or branches) 

# Acceptance - [ ] Feature Tracker has been updated - [ ] Proper release label has been added 

[fhennig]

Can you add a new page to the usage guide explaining this feature?

[adwk67]

All tests pass on Openshift. Latest subset run: topology-provider and kerberos (with chaosmonkey) tests:

--- PASS: kuttl (1352.29s) --- PASS: kuttl/harness (0.00s) --- PASS: kuttl/harness/topology-provider_hadoop-latest-3.3.4_zookeeper-latest-3.8.3_kerberos-backend-mit_openshift-true (342.02s) --- PASS: kuttl/harness/kerberos_hadoop-latest-3.3.4_zookeeper-latest-3.8.3_kerberos-realm-PROD.MYCORP_kerberos-backend-mit_openshift-true (1343.58s) ... --- PASS: kuttl/harness/orphaned-resources_hadoop-latest-3.3.4_zookeeper-latest-3.8.3 (174.36s) --- PASS: kuttl/harness/logging_hadoop-3.3.6_zookeeper-latest-3.8.3 (296.34s) --- PASS: kuttl/harness/profiling_hadoop-3.3.6_zookeeper-latest-3.8.3_openshift-true (172.60s) --- PASS: kuttl/harness/cluster-operation_hadoop-latest-3.3.4_zookeeper-latest-3.8.3 (297.05s) 

N.B. for OKD 4.14/4.15 tests it may be necessary to run tests with parallel=1 and to restore the resources on the logging test to the defaults.

[adwk67]

Openshift tests (with chaos-monkey) after the merge of PR 491 (noticeably more stable):

--- PASS: kuttl (2257.19s) --- PASS: kuttl/harness (0.00s) --- PASS: kuttl/harness/profiling_hadoop-3.3.6_zookeeper-latest-3.8.3_openshift-true (177.00s) --- PASS: kuttl/harness/cluster-operation_hadoop-latest-3.3.4_zookeeper-latest-3.8.3 (262.05s) --- PASS: kuttl/harness/topology-provider_hadoop-latest-3.3.4_zookeeper-latest-3.8.3_kerberos-backend-mit_openshift-true (331.70s) --- PASS: kuttl/harness/orphaned-resources_hadoop-latest-3.3.4_zookeeper-latest-3.8.3 (163.08s) --- PASS: kuttl/harness/logging_hadoop-3.3.6_zookeeper-latest-3.8.3 (655.99s) --- PASS: kuttl/harness/smoke_hadoop-3.3.6_zookeeper-3.8.3_zookeeper-latest-3.8.3_number-of-datanodes-2_datanode-pvcs-2hdd-1ssd_listener-class-external-unstable (245.62s) --- PASS: kuttl/harness/kerberos_hadoop-latest-3.3.4_zookeeper-latest-3.8.3_kerberos-realm-PROD.MYCORP_kerberos-backend-mit_openshift-true (1491.31s) 

[adwk67]

Re-run jenkins: https://ci.stackable.tech/view/02%20Operator%20Tests%20(custom)/job/hdfs-operator-it-custom/136/ 🟢

[siegfriedweber]

LGTM