Add 'timeMs' field to /privet/info local API

Added the local device time field to the Info response. The timestamp
is a time in milliseconds since Epoch (similar to how the time is
used with the cloud server).

BUG: 26160070
Change-Id: I3059f2880dc2aa4c1990bbe662e8c1057b1aadc1
Reviewed-on: https://weave-review.googlesource.com/1922
Reviewed-by: Vitaly Buka <vitalybuka@google.com>
3 files changed