Ensure HTTP 200 status is sent when get_characteristics has no failures #337
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Previously we always sent a multi-status of 207 even when
there were no failures. HomeKit expects a HTTP 200 response
when there are no failures, and for status to be not
be set in the 100% success state.
This change drastically reduces the amount of polling that
the iOS device does because it no longer schedules a retry
based on the unexpected 207 which translates into a meaningful
improvement in battery life.