Return original _id in getTotals request

[jiekang]

Fixes #850

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[llxia]

• This does not work when URL, buildName, and buildNum are the input parameters. In this case, _id returns null.
• This is an aggregation API. This change limits us to pass in a set of ids in the future. We cannot aggregate on ids.
• Return the input in the output is not a standard practice. In general, APIs should strive for clarity, simplicity, and adherence to the principle of "separation of concerns".
• @karianna I understand it is just one line change, but it has some implications. I would appreciate it if the requested reviewer could have a chance to review before the PR gets merged. This is an API change. The code should be tested before it gets merged.

[smlambert]

@llxia - feel free to revert - we can discuss best plan for metrics gathering in the issue and then re-approach

[llxia]

Thanks @smlambert . I will create a separate PR to remove line 162, preventing any potential confusion down the road.
Sure, let's discuss metrics gathering approaches.