[RFC]Add dockerfile to support dovetail in CentOS

[RFC]Add dockerfile to support dovetail in CentOS

JIRA: DOVETAIL-151

This diff introduces an optional dovetail dockerfile based on CentOS.
It provides users to have an alternative way to execute dovetail.
It should be just a optional, so we should keep docker/Dockerfile
as official one with dockerhub's image and we do not build docker images
in CI phase for now.

Change-Id: Ia694bcd49f65ff2bc175c1da3b42fbfa19b022a1
Signed-off-by: Tomofumi Hayashi <tohayash@redhat.com>
Signed-off-by: Zenghui Shi <zshi@redhat.com>