rgw/admin: remove unknown user test case from user_bucket_test.go

[thotz]

Fixes: #984

Checklist

• Added tests for features and functional changes
• Public functions and types are documented
• Standard formatting is applied to Go code
• Is this a new API? Added a new file that begins with //go:build ceph_preview
• Ran make api-update to record new APIs

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[phlogistonjohn]

I had to take a look at the conversation in the issue but this change aligns with @anoopcs9 request. Change looks ok to me, but as this is not an API change I would like @anoopcs9 to do the official approving. :-)

[ansiwen]

Thanks for taking care of that! LGTM.

[phlogistonjohn]

lol. well, it got two approvals anyway :-D

[ansiwen]

I had to take a look at the conversation in the issue but this change aligns with @anoopcs9 request. Change looks ok to me, but as this is not an API change I would like @anoopcs9 to do the official approving. :-)

Oops, sorry, I reviewed at the same moment. I think this is fine, he also just said "remove it".