HDDS-3911. Compile error in acceptance test on HDDS-2823

[adoroszlai]

What changes were proposed in this pull request?

Fix compile error in acceptance check on HDDS-2823 branch. The error is caused by the following:

1. HDDS-3597 eliminated the need for installing Protobuf, now we use protobuf-maven-plugin to compile .proto files.
2. HDDS-3757 changed acceptance check to build directly on GitHub's runner. Previously it was built inside a docker container which comes with Protobuf pre-installed.
3. HDDS-3621 moved proto files to separate subprojects.
4. HDDS-3186 introduced SCMRatisProtocol.proto on the HDDS-2823 branch, in the old location and using hadoop-maven-plugins:protoc to compile it. (It was the correct location and plugin at that time.)
5. 82c30a4 merged the above 1-3 changes from master to HDDS-2823, so now protoc is no longer available when building Ozone for acceptance. Other checks are still run in the docker container, so they are not affected.

The fix is to move new SCMRatisProtocol.proto to hadoop-hdds/interface-server project, and let it be compiled by protobuf-maven-plugin.

https://issues.apache.org/jira/browse/HDDS-3911

How was this patch tested?

Compiled locally after uninstalling Protobuf:

$ which protoc
protoc not found

$ mvn -DskipTests clean package
...
[INFO] BUILD SUCCESS

Acceptance test compiles fine:
https://github.com/adoroszlai/hadoop-ozone/runs/826834813#step:5:8603

[timmylicheng]

Is this happening for master as well?

[adoroszlai]

Is this happening for master as well?

No, it's specific to the HDDS-2823 branch. I've updated the PR description with an explanation.

[nandakumar131]

The test failure doesn't seem to be related. Thanks @adoroszlai for the quick fix.

[nandakumar131]

I have retriggered the prechecks.

[xiaoyuyao]

Change LGTM, +1 pending CI.

[timmylicheng]

I will merge this. Thanks @adoroszlai for the contribution.