Add test code from java_common

[MrCreosote]

When packing java_common from jitpack.io, only the code in main/java is packed, (which makes sense) which doesn't include any of the code here. Moving the test halper code to main/java would mean that junit and hamcrest would now be in the runtime classpath, which we don't want, so it seems the least bad option is to make a new library.

Also copied over the blobstore and minio controllers from workspace. The mysql controller is unused to my knowledge so it was not copied.

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[Xiangs18]

In blobstore repo, there were also a bunch of controllers: https://github.com/kbase/blobstore/tree/develop/test.
Do they serve different purposes?

[Xiangs18]

Also, I am not sure why we need @SuppressWarnings("unused") in all noop(). Because foo is unused?
I ran gradle build with and without @SuppressWarnings("unused"), I did not see any difference. Am I missing something?

[MrCreosote]

In blobstore repo, there were also a bunch of controllers

• Mongo is in this repo
• Minio is in the workspace repo because that's the only java service that uses it. If more services start using it we should move it here Minio is in this repo
• Auth lives in the auth repo

[MrCreosote]

Also, I am not sure why we need @SuppressWarnings("unused")

It prevents IDEs from complaining about unused variables. There's also probably some way to get Gradle to report out on compile warnings, but I guess by default it doesn't

[Xiangs18]

LGTM!