Add clover initial docker image build script

Add clover initial docker image build script

- install dependent deb/pip packages
- install basic tools istioctl, kubectl
- install clover source code
- build/upload docker image script
- update requirements.txt
- update module import path

- To use this image use need setup kube-config file.
    e.g. `docker run -v /root/config:/root/.kube/config -it clover bash`

Change-Id: I91044bb99ce8e2b785ef03212d961a97b3d42233
Signed-off-by: QiLiang <liangqi1@huawei.com>
(cherry picked from commit c68b7b8380ea8d2ac4da6b4739c6b8e157bb952b)