Move truststore creator to server package for cloud builds

[todvora]

/nocl internal refactoring

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Refactoring (non-breaking change)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.

[moesterheld]

Haven't run the cloud build locally (Bernd will), but the code changes lgtm.

[bernd]

The Cloud build now fails with the following error:

[ERROR] /home/bernd/graylog/cloud-builds/modules/graylog2-server/full-backend-tests/src/test/java/org/graylog/datanode/ClientCertResourceIT.java:[31,36] error: cannot find symbol
  symbol:   class TruststoreCreator
  location: package org.graylog.security.certutil
[ERROR] /home/bernd/graylog/cloud-builds/modules/graylog2-server/full-backend-tests/src/test/java/org/graylog/datanode/ClientCertResourceIT.java:[134,15] error: cannot find symbol
  symbol:   variable TruststoreCreator
  location: class ClientCertResourceIT
[INFO] 2 errors 

[bernd]

The Cloud build now fails with the following error:

[ERROR] /home/bernd/graylog/cloud-builds/modules/graylog2-server/full-backend-tests/src/test/java/org/graylog/datanode/ClientCertResourceIT.java:[31,36] error: cannot find symbol
  symbol:   class TruststoreCreator
  location: package org.graylog.security.certutil
[ERROR] /home/bernd/graylog/cloud-builds/modules/graylog2-server/full-backend-tests/src/test/java/org/graylog/datanode/ClientCertResourceIT.java:[134,15] error: cannot find symbol
  symbol:   variable TruststoreCreator
  location: class ClientCertResourceIT
[INFO] 2 errors 

The TruststoreCreator still lives in the data-node/ Maven module. Which we don't build.

[moesterheld]

I think we shouldn't create packages other than org.graylog.datanode in the datanode module. That makes it easier to check and that's why I didn't see it right away.

[todvora]

Sorry for the confusion, moving class between packages in idea did something that I haven't expected and created new package in the same project, instead of moving to an existing package in the server project. Fixed now.

[bernd]

The Cloud build works again. Thanks!