SAMZA-1559 moving hello-samza repo to samza repo and put in samza-samples directory

[fredji97]

Tested and jobs can be deployed in the new place. After this is committed, we will do the following two in order:

1. adjust the documentation to use the sample jobs from the new place;
2. remove the old hello-samza repo.

[nickpan47]

There is an earlier ticket that covers this issue as well. Please check https://issues.apache.org/jira/browse/SAMZA-205 to see how much this PR covers the issues discussed in that thread.

[prateekm]

@fredji97 Doesn't seem like the deploy directory be a part of this commit. Are you moving a clean copy or a local copy?

[fredji97]

@nickpan47, thanks for the referenced JIRA.

I am considering breaking the task of this SAMZA-205 into 4 steps:

1. Move hello-samza repo to samza-samples directory of samza repo;
2. Update the documentation related hello-samza to use the code in samza/samza-samples;
3. Delete hello-samza repo;
4. build a gradle target such as samzaSampleIntegrationTests to hook the tests in samza/samza-samples.

And this PR is the first step. After this one is done, 2&3 need to be done soon as well to bring it on par with the current situation. And 4 then can be done independently.

[fredji97]

@prateekm Thanks for checking the directories. Actually, deploy directory is generated when running the test. We prefer not to want to check the deploy directory into the repo.

[prateekm]

@fredji97 also, have you tried moving the files in the existing hello-samza repo to this repo such that it preserves git history? If not, we should try that first before copying files over.

[fredji97]

@prateekm Thanks for the comments. I have pulled in the hello-samza git log history as well.

[shanthoosh]

@fredji97 I think after yi pan's serializable operator changes, samza-hello-samza repository does not build with samza open source head. I'm fixing the compilation problems in samza-hello-samza. Please update the PR with my fixes and then merge it.