feat(docker-kubectl): update kubectl to v1.12.2
feat(docker-kubectl): update kubectl to v1.12.2

update kubectl to v1.12.2
change base image to docker ce

Signed-off-by: mritd <5e32f0eba9fe05ce3130319227c65e0e1e62b272@gmail.com>

mritd/dockerfile,mritd/dockerfile,mritd/dockerfile,mritd/dockerfile