Add bug fix in bucket local variable

[luigi-bitonti]

As you suggested, I made the change only to the local variable.
With this change, "bucket" variable will have the value of "var.bucket_name" only if the bucket has to be created.
Otherwise, it will have the name of the created bucket.

Checklist

I applicable, I acknowledge that I have:

• Read the contributing guide
• Ran terraform fmt on all modified files
• Regenerated the relevant README.md files using tools/tfdoc.py
• Made sure all relevant tests pass

[wiktorn]

Oh, now I see the bug :-) Thanks a lot.

Let me update this a bit

[wiktorn]

Can you pull changes from here ? This adds tests that verify that the bug is actually fixed and also covers cloud functions v1.

[luigi-bitonti]

I did it. I don't know if it was the correct way to merge your change, but trying to merge all the branch I saw that there are a lots file changed because your branch is is 81 commits behind GoogleCloudPlatform:master.
So I basically copied and pasted only the file changed on your last commit.

[wiktorn]

Thank you, I thought that I based that on your branch, but maybe I missed something. git cherry-pick should also work in this case.