Add gnocchi-statsd support for Debian systems
Add gnocchi-statsd support for Debian systems

The current Docker container for gnocchi-statsd is missing support
for Ubuntu and will fail on start due to missing gnocchi-statsd
package.
Dockerfile extended by the required gnocchi-statsd package.

Closes-Bug: #1700513
Change-Id: I0c5d221f08ae7f1c4a81f83a5ec3fb75e5207b2b

rahulunair/kolla,stackforge/kolla,rahulunair/kolla,nihilifer/kolla,mrangana/kolla,openstack/kolla,stackforge/kolla,openstack/kolla,GalenMa/kolla,mrangana/kolla,GalenMa/kolla,stackforge/kolla,nihilifer/kolla