Fix the overwrite sudoers file issue

docker/ceilometer/ceilometer-base/Dockerfile.j2

docker/cinder/cinder-base/Dockerfile.j2

docker/elasticsearch/Dockerfile.j2

docker/glance/glance-base/Dockerfile.j2

docker/heka/Dockerfile.j2

docker/manila/manila-base/Dockerfile.j2

docker/mariadb/Dockerfile.j2

docker/mongodb/Dockerfile.j2

docker/neutron/neutron-base/Dockerfile.j2

docker/nova/nova-base/Dockerfile.j2

docker/rabbitmq/Dockerfile.j2

docker/swift/swift-base/Dockerfile.j2