[driver] run analysis and reporting for "analyze" commands

Summary:
Now `infer analyze` really has the same behaviour as `infer -- analyze`.
Previously it wouldn't create report.json or report.

Reviewed By: jeremydubreil

Differential Revision: D5172875

fbshipit-source-id: 8f9ddd1

infer/src/backend/infer.ml

@@ -556,7 +556,7 @@ let () =
         Config.print_usage_exit ()
       );
       InferAnalyze.register_perf_stats_report ();
-      execute_analyze ()
+      analyze Analyze
   | Clang ->
       let prog, args = match Array.to_list Sys.argv with
         | prog::args -> prog, args