* Because in dockerhub, we cannot set the `docker build `running
  directory, we could only use `git clone` command to get the latest
  code if we put `Dockerfile` in subdirectory

* But the `git clone` will checkout the default branch only, so here
  we add a `ENV` in Dockerfile to checkout special branch or tag in
  git repo. We could change it to `V0.9.0` tag when it release.

* Add noavx to docker
* Not to use directory to split Docker image.

ISSUE=4600307


git-svn-id: https://svn.baidu.com/idl/trunk/paddle@1439 1ad973e4-5ce8-4261-8a94-b56d1f490c56

ISSUE=4599521


git-svn-id: https://svn.baidu.com/idl/trunk/paddle@1434 1ad973e4-5ce8-4261-8a94-b56d1f490c56

ISSUE=4590133


git-svn-id: https://svn.baidu.com/idl/trunk/paddle@1418 1ad973e4-5ce8-4261-8a94-b56d1f490c56

to fit hub.docker.com

ISSUE=4589547



git-svn-id: https://svn.baidu.com/idl/trunk/paddle@1417 1ad973e4-5ce8-4261-8a94-b56d1f490c56

ISSUE=4586495

git-svn-id: https://svn.baidu.com/idl/trunk/paddle@1408 1ad973e4-5ce8-4261-8a94-b56d1f490c56