Added configuration to ansible/roles/telegraf/templates/telegraf.conf.j2 to
allow telegraf to grab telemetry data from docker directly.
Added option to etc/kolla/globals.yml to switch on/off the configuration to
ingest data from the docker daemon into telegraf.
Change-Id: Icbebc415d643a237fa128840d5f5a9c91d22c12d
Signed-off-by: Keith Plant <kplantjr@gmail.com>