Refined netconf none semantics in tests and text datastore

apps/restconf/README.md

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+Clixon Restconf
+===============
+
+Contents:
+1. Features
+2. Installation using NGINX
+3. Debugging
+
+1. FEATURES
++++++++++++
+Clixon restconf is a daemon based on FASTCGI. Instructions are available to
+run with NGINX. 
+The implementatation supports plain OPTIONS, HEAD, GET, POST, PUT, PATCH, DELETE.
+and is based on draft-ietf-netconf-restconf-13. 
+There is currently (2017) a RFC 8040, many of those features are _not_ implemented,
+including:
+- query parameters (section 4.9)
+- notifications (sec 6)
+- only rudimentary error reporting exists (sec 7)
+
+2. INSTALLATION using NGINX
++++++++++++++++++++++++++++
+
+# Define nginx config file/etc/nginx/sites-available/default
+server {
+  ...
+  location /restconf {
+    root /usr/share/nginx/html/restconf;
+    fastcgi_pass unix:/www-data/fastcgi_restconf.sock;
+    include fastcgi_params;
+  }
+}
+# Start nginx daemon
+sudo /etc/init.d nginx start
+
+# Start clixon restconf daemon
+olof@vandal> sudo su -c "/www-data/clixon_restconf -f /usr/local/etc/routing.conf " -s /bin/sh www-data
+
+# Make restconf calls with curl
+olof@vandal> curl -G http://127.0.0.1/restconf/data/interfaces
+[
+  {
+    "interfaces": {
+      "interface":[
+        {
+          "name": "eth0",
+          "type": "eth",
+          "enabled": "true",
+          "name": "eth9",
+          "type": "eth",
+          "enabled": "true"
+         }
+      ]
+    }
+  }
+]
+olof@vandal> curl -G http://127.0.0.1/restconf/data/interfaces/interface/name=eth9/type
+[
+  {
+    "type": "eth" 
+  }
+]
+
+curl -sX POST -d '{"clicon":{"interfaces":{"interface":{"name":"eth1","type":"eth","enabled":"true"}}}}' http://localhost/restconf/data
+
+
+3. DEBUGGING
+++++++++++++
+Start the restconf fastcgi program with debug flag:
+sudo su -c "/www-data/clixon_restconf -Df /usr/local/etc/routing.conf" -s /bin/sh www-data
+
+Look at syslog:
+tail -f /var/log/syslog | grep clixon_restconf
+
+Send command:
+curl -G http://127.0.0.1/restconf/data/*
+