send priority instrumentation message on startup with version info

pkg/analysis_server/lib/src/domain_server.dart

Index: pkg/analysis_server/lib/src/domain_server.dart
diff --git a/pkg/analysis_server/lib/src/domain_server.dart b/pkg/analysis_server/lib/src/domain_server.dart
index 607fb3da89b927db1489e7c093d945f961855d07..37b6822f378456a642e302ac26fe57c9e729141c 100644
--- a/pkg/analysis_server/lib/src/domain_server.dart
+++ b/pkg/analysis_server/lib/src/domain_server.dart
@@ -27,7 +27,8 @@ class ServerDomainHandler implements RequestHandler {
    * Return the version number of the analysis server.
    */
   Response getVersion(Request request) {
-    return new ServerGetVersionResult('0.0.1').toResponse(request.id);
+    return new ServerGetVersionResult(
+        ANALYSIS_SERVER_VERSION).toResponse(request.id);
   }
 
   @override