Reduce spew data dumped

Signed-off-by: Brian Goff <cpuguy83@gmail.com>

daemon/debugtrap.go

@@ -27,7 +27,36 @@ func (d *Daemon) dumpDaemon(dir string) (string, error) {
 		return "", errors.Wrap(err, "failed to open file to write the daemon datastructure dump")
 	}
 	defer f.Close()
-	spew.Fdump(f, d) // Does not return an error
+
+	dump := struct {
+		containers      interface{}
+		names           interface{}
+		links           interface{}
+		execs           interface{}
+		volumes         interface{}
+		images          interface{}
+		layers          interface{}
+		imageReferences interface{}
+		downloads       interface{}
+		uploads         interface{}
+		registry        interface{}
+		plugins         interface{}
+	}{
+		containers:      d.containers,
+		execs:           d.execCommands,
+		volumes:         d.volumes,
+		images:          d.imageStore,
+		layers:          d.layerStore,
+		imageReferences: d.referenceStore,
+		downloads:       d.downloadManager,
+		uploads:         d.uploadManager,
+		registry:        d.RegistryService,
+		plugins:         d.PluginStore,
+		names:           d.nameIndex,
+		links:           d.linkIndex,
+	}
+
+	spew.Fdump(f, dump) // Does not return an error
 	f.Sync()
 	return path, nil
 }