feature(grafana): Grafana uses url, user and password from configuration,...

feature(grafana): Grafana uses url, user and password from configuration, check mon.yml for more details

Change-Id: I223e07e599f87ec07fe09c73dd68cd89aecc73bf
Signed-off-by: bravof <fbravo@whitestack.com>
(cherry picked from commit 396648b6)