Move Dockerfile to ./docker path

Move Dockerfile to ./docker path

According to other projects(releng/jjb/releng/opnfv-docker.yml), all the
Dockerfiles are put in ./docker path.

The daisy docker build procedure will be seperated from daisy bin file
build procedure. The daisy docker will be directly used during the bin
build procedure. It will help to safe the build time.

A seperate job will be created in Jenkins to monitor the Docker changes
and will build the docker image.

Change-Id: Ib68ec3657d7296041aa9dc99f8e578cb0466679f
Signed-off-by: Julien <zhang.jun3g@zte.com.cn>