This commit consists of:
1) Dockerizing the netconf server
2) Update proto2yang to support module imports
3) Provide a set of yang modules derived from the proto files in voltha.
   These files as well as the slight mmodifications to the proto files are
   provided in the experiments/netconf/proto2yang directory
4) Code to automatically pull proto files from voltha into the netconf server,
   compiles them and produce the yang equivalent files.
5) Add a getvoltha netconf API to provide voltha state information (basic at
   this time).  There is potential to make this generic once we experiment
   with additional APIs

Change-Id: I94f3a1f871b8025ad675d5f9b9b626d1be8b8d36
diff --git a/experiments/netconf/proto2yang/ietf-empty.yang b/experiments/netconf/proto2yang/ietf-empty.yang
new file mode 100644
index 0000000..c2ee52b
--- /dev/null
+++ b/experiments/netconf/proto2yang/ietf-empty.yang
@@ -0,0 +1,35 @@
+
+module ietf-empty {
+
+
+    namespace "urn:opencord:params:xml:ns:voltha:ietf-empty";
+    prefix empty;
+
+
+    organization "CORD";
+    contact
+        " Any name";
+
+    description
+        "";
+
+    revision "2016-11-15" {
+        description "Initial revision.";
+        reference "reference";
+    }
+
+
+    grouping Empty {
+        description
+            "A generic empty message that you can re-use to avoid defining duplicated
+ empty messages in your APIs. A typical example is to use it as the request
+ or the response type of an API method. For instance:
+
+     service Foo  
+       rpc Bar(google.protobuf.Empty) returns (google.protobuf.Empty);
+      
+
+ The JSON representation for `Empty` is empty JSON object `  `.";
+    }
+
+}
\ No newline at end of file