[Dockerapi] Auto detect version of docker server

Some older versions of docker need specific version of client api to be able to
communicate. This change allows automatically detect and set version of API to
match server version of API.

Fixes #765

data/Dockerfiles/dockerapi/server.py

@@ -7,7 +7,7 @@ import docker
 import signal
 import time
 
-docker_client = docker.DockerClient(base_url='unix://var/run/docker.sock')
+docker_client = docker.DockerClient(base_url='unix://var/run/docker.sock', version='auto')
 app = Flask(__name__)
 api = Api(app)