Refactored to make the docker stuff self contained and removed the
unnecessary files from the root directory. Also created a readme file to
concretize how this feature works.
Also added an example script to set up Mistral with MySQL.
Closes-Bug: #1585911
Change-Id: I7fbcccb9d7ad168c5391e71326b205d074ab01ab
Signed-off-by: Andras Kovi <akovi@nokia.com>