Add nsenter in vm-ship.
Add dockerized koha to vm-ship.
Make tests target vm-ship.

Known issue:
* Some tests fail because they need immediate zebra-reindexing.
Add make commands for stopping and deleting containers
Remove unused vm ls.ext
Remove unused salt-states and files
Update diagram
Refactor re-indexing to work in a docker-world.
Add delete_db in Makefile
git.installed docker, not latest
Add mysql data volume container

and rework ports and volumes settings for mysql and koha containters
Merge remote-tracking branch 'origin/dockerizing-koha'