Add docker-compose support

[DevilTea]

What this PR has done:

• Update Dockerfile
  • Upgrade the version of the openjdk image to 1.8.
  • Add an add-on for waiting db service available.
• Add docker-compose.yml
  • Make the services (server and db) run as normal process that using the ports (3306, 8484, 7575 .etc) on host directly.
  • The service of server would start after the db is ready.

Why:

In order to host HeavenMS in any environment with docker and docker-compose by executing only one single command.

$ docker-compose up

If source code or config is changed, you would have to re-build the image and re-create a container of it.