remove unused template file in baremetal role

Change-Id: I5f8598368ad93530d159816c004f27765b165afc

ansible/roles/baremetal/templates/docker_defaults.j2

-# Docker Upstart and SysVinit configuration file
-
-#
-# THIS FILE DOES NOT APPLY TO SYSTEMD
-#
-#   Please see the documentation for "systemd drop-ins":
-#   https://docs.docker.com/engine/articles/systemd/
-#
-
-# Customize location of Docker binary (especially for development testing).
-#DOCKERD="/usr/local/bin/dockerd"
-
-# Use DOCKER_OPTS to modify the daemon startup options.
-DOCKER_OPTS=""
-{% if docker_storage_driver %}
-DOCKER_OPTS="$DOCKER_OPTS --storage-driver={{ docker_storage_driver }}"
-{% endif %}
-{% if docker_registry %}
-DOCKER_OPTS="$DOCKER_OPTS --insecure-registry {{ docker_registry }}"
-{% endif %}
-
-# If you need Docker to use an HTTP proxy, it can also be specified here.
-#export http_proxy="http://127.0.0.1:3128/"
-
-# This is also a handy place to tweak where Docker's temporary files go.
-#export TMPDIR="/mnt/bigdrive/docker-tmp"