HDDS-8518. Admin SCM decommission command primordial node support

[neils-dev]

What changes were proposed in this pull request?

Changes to SCM decommission command to support decommissioning of primordial SCM node.

What is the link to the Apache JIRA

https://issues.apache.org/jira/browse/HDDS-8518

How was this patch tested?

Manual testing - decommissioning primordial scm node:

Bring up cluster with SCM-HA 3 nodes, primary scm nodeid = scm1

bash-4.2$ ozone admin scm roles   
scm1.org:9894:LEADER:3f61f995-7316-47a5-ba1f-255749874c7d:172.25.0.116
scm3.org:9894:FOLLOWER:9ab89602-7c32-4f52-8c78-5f9a620ef70a:172.25.0.118
scm2.org:9894:FOLLOWER:35b1e08f-660c-4c7c-86d3-7a02e082b2a8:172.25.0.117

Transfer scm leader to non-primordial node, scmid=scm3

bash-4.2$ ozone admin scm transfer --newLeaderId=9ab89602-7c32-4f52-8c78-5f9a620ef70a
Transfer leadership successfully to 9ab89602-7c32-4f52-8c78-5f9a620ef70a.

Decommission primordial scm node:

bash-4.2$ ozone admin scm decommission --nodeid=3f61f995-7316-47a5-ba1f-255749874c7d
Decommissioned Scm 3f61f995-7316-47a5-ba1f-255749874c7d

bash-4.2$ ozone admin scm roles
scm3.org:9894:LEADER:9ab89602-7c32-4f52-8c78-5f9a620ef70a:172.25.0.118
scm2.org:9894:FOLLOWER:35b1e08f-660c-4c7c-86d3-7a02e082b2a8:172.25.0.117

[ChenSammi]

@neils-dev , thanks for working on this. The patch overall looks good. Could you add a robot smoke test for this decommission process? Robot test can be put under hadoop-ozone/dist/src/main/smoketest/scmha.

[neils-dev]

Thanks @ChenSammi. Added robot test for testing scm decommissioning. Tested in ozonesecure-ha.

Robot test can be put under hadoop-ozone/dist/src/main/smoketest/scmha.

[ChenSammi]

Thanks @neils-dev, the patch LGTM +1.