fix nova-base dockerfile

- use correct namespace for base image
- mariadb and openstack-utils are installed by fedora-rdo-base

Change-Id: I9c8bccab10f8b9dc66340fb94d45c90d1a39fea9

docker/nova-compute/nova-base/Dockerfile

-FROM fedora-rdo-base
+FROM kollaglue/fedora-rdo-base
 MAINTAINER Steven Dake <sdake@redhat.com>
 
-RUN yum -y install \
-	openstack-utils \
-        openstack-nova-common \
-        mariadb && yum clean all
+RUN yum -y install openstack-nova-common; yum clean all
+