(Part 2.1) Use new socket schema in ValueMetricProducer_test

Sending ValueMetricProducer_test as multiple CLs to retain diff and make
it easier to review.

I added a few different CreateLogEvent functions that account for tests
that need events with 0, 2, and 3 values.

The old #createEvent function took in one value but added it twice to the
LogEvent. I replaced this with #CreateRepeatedValueLogEvent. Any events
made with #createEvent or that took the form of:
event.write(tagId)
event.write(value)

was replaced with a call to #CreateRepeatedValueLogEvent. I assumed
that the tagId was used as the first field because an arbitrary number
was needed.

Test: bit statsd_test:*
Bug: 149590301
Change-Id: I26de8074a66babcf3ab7ee395be0598d88b4ba59