Minor changes to match recent design changes

src/node/health_check/health.js

@@ -51,7 +51,7 @@ HealthImplementation.prototype.setStatus = function(service, status) {
 
 HealthImplementation.prototype.check = function(call, callback){
   var service = call.request.service;
-  callback(null, {status: _.get(this.statusMap, service, 'UNSPECIFIED')});
+  callback(null, {status: _.get(this.statusMap, service, 'UNKNOWN')});
 };
 
 module.exports = {

src/node/health_check/health.proto

@@ -37,7 +37,7 @@ message HealthCheckRequest {
 
 message HealthCheckResponse {
   enum ServingStatus {
-    UNSPECIFIED = 0;
+    UNKNOWN = 0;
     SERVING = 1;
     NOT_SERVING = 2;
   }

src/node/test/health_test.js

@@ -80,11 +80,11 @@ describe('Health Checking', function() {
                          done();
                        });
   });
-  it('should respond with UNSPECIFIED for an unknown service', function(done) {
+  it('should respond with UNKNOWN for an unknown service', function(done) {
     healthClient.check({service: 'unknown.service.Name'},
                        function(err, response) {
                          assert.ifError(err);
-                         assert.strictEqual(response.status, 'UNSPECIFIED');
+                         assert.strictEqual(response.status, 'UNKNOWN');
                          done();
                        });
   });