Unify the docker images build method

[typhoonzero]

We now have the following docker images need to be built to run on the cluster:

• EDL controller
• Cloud server
• PFS server
• Cloud job runtime image

The Dockerfiles and build method is different, need a unified way or a script to build them all.

[typhoonzero]

Or, we can put all component in one Docker image and run several pods using the same image.