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-health.yang b/experiments/netconf/proto2yang/ietf-health.yang
new file mode 100644
index 0000000..e79c30a
--- /dev/null
+++ b/experiments/netconf/proto2yang/ietf-health.yang
@@ -0,0 +1,65 @@
+
+module ietf-health {
+
+
+    namespace "urn:opencord:params:xml:ns:voltha:ietf-health";
+    prefix health;
+
+    import ietf-empty { prefix empty ; }
+
+    organization "CORD";
+    contact
+        " Any name";
+
+    description
+        "";
+
+    revision "2016-11-15" {
+        description "Initial revision.";
+        reference "reference";
+    }
+
+
+    grouping HealthStatus {
+        description
+            "Encode health status of a Voltha instance";
+        leaf state {
+            type  HealthState; 
+            description
+                "Current state of health of this Voltha instance";
+        }
+
+        typedef HealthState {
+            type enumeration {
+                enum HEALTHY {
+                    description "";
+                }
+                enum OVERLOADED {
+                    description "";
+                }
+                enum DYING {
+                    description "";
+                }
+            }
+            description
+                "Health states";
+        }
+
+    }
+
+    /*  Health related services" */
+    rpc HealthService-GetHealthStatus {
+        description
+            "Return current health status of a Voltha instance";
+        input {
+            uses  empty:Empty;
+
+        }
+        output {
+            uses  HealthStatus;
+
+        }
+    }
+
+
+}
\ No newline at end of file