Updates Heat Template for M3 Release

Updates the following:

1. Replaces Docker copr pkgs with binary
2. Updates docs
3. Adds compose from sdake GH repo
4. Adds required ebtables kernel module for nova-network
5. Adds container net/subnet info required for correct nova
networking functionality.
6. Consolidates pkgs installs from get-image script to the
heat template.

Change-Id: Ibec2dd5909bb8379c193b5cdbad665a5b6c2e8f8