[HEALTHCHECK] Enhance healthcheck logging

    Add a timestamp to every log entry
    Make a log entry when the application starts
    Make a single log entry (instead of 2) for the outbound HTTP requests to the k8s API
    Update node.js base image to the 16.x.x LTS release (from 14.x.x).

Issue-ID: DCAEGEN2-2958
Issue-ID: DCAEGEN2-2983
Signed-off-by: Jack Lucas <jflos@sonoris.net>
Change-Id: Ib275afbd0c871d4e82dda269606d243f3b6d89e4
7 files changed