Add Dockerfile

Add this dockerfile for developer and contributor, those who can
build their own developement environment easily and quickly. Without
any worry about the python packages incompatible.

Change-Id: Ie045c6221004f60a3af73f53b1370a3e431e96e0

contrib/quick-start/Dockerfile

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+FROM alpine:3.7
+WORKDIR /opt
+
+RUN apk update \
+  && apk add --no-cache\
+       bash \
+       iproute2 \
+       openvswitch \
+       py-pip \
+       python \
+       uwsgi-python \
+       libffi-dev \
+       openssl-dev \
+  && apk add --no-cache --virtual build-deps \
+      gcc \
+      git \
+      linux-headers \
+      musl-dev \
+      python-dev \
+  && pip install -U pip setuptools \
+  \
+  && git clone https://github.com/openstack/zun \
+  && cd /opt/zun \
+  && pip install -r ./requirements.txt \
+  && python setup.py install \
+  && cd / \
+  && apk del build-deps
+
+VOLUME /var/log/zun
+VOLUME /etc/zun

contrib/quick-start/README.md

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+Budil-Zun-Service-Dcoker Image
+=======================
+
+By using this dockerfile, you can build your own Zun service docker container eaily and quickly.
+
+Build docker container image
+for example, we build a docker container image named `zun-service-img`.
+```docker build -t zun-service-img .```
+
+Run zun service container
+Start a container by unsing our build image above.
+```docker run --name zun-service \
+   --net=host \
+   -v /var/run:/var/run \
+   zun-service-img```
+
+
+Note: You should enter the container and config the zun config file in the path /etc/zun/,
+More info about the config please reference the installation docs.