This adds to the definition of the collectd API the ability to turn on
and off specific collectd metrics.
For the GET end point a POST option was added that allow to enable or
disable a metric.
The general GET endpoint now returns the enable flag that indicates if
the metric is enable.
Signed-off-by: Amnon Heiman <amnon@scylladb.com>
Message-Id: <1466932139-19264-2-git-send-email-amnon@scylladb.com>
