Added Clixon example full system docker container, see [docker/system].

docker/system/README.md

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+# Clixon example container
+
+This directory show how to build a "monolithic" clixon docker
+container containing the example application with both restconf,
+netconf, cli and backend.
+The directory contains the following files:
+	 cleanup.sh     kill containers
+	 Dockerfile     Docker build instructions
+	 lib.sh         script library functions
+	 Makefile.in    "make docker" builds the container
+	 README.md	This file
+	 start.sh       Start containers
+	 startsystem.sh Internal start script copied to inside the container
+	 stat.sh        Shows container status
+
+How to build and start the container:
+```
+  $ make docker
+  $ ./start.sh 
+```
+
+Once running you can access it as follows:
+* CLI: `sudo docker exec -it ef62ccfe1782 clixon_cli`
+* Netconf: `sudo docker exec -it ef62ccfe1782 clixon_netconf`
+* Restconf: `curl -G http://localhost/restconf`
+
+To check status and then kill it:
+```
+  $ ./stat.sh
+  $ ./cleanup.sh 
+```