Speed up createmobilespec.js a bit by adding all plugins in one exec
diff --git a/createmobilespec/createmobilespec.js b/createmobilespec/createmobilespec.js
index 95788bd..73c967d 100755
--- a/createmobilespec/createmobilespec.js
+++ b/createmobilespec/createmobilespec.js
@@ -451,12 +451,14 @@
 
         // Install new-style test plugins
         console.log("Adding plugin tests using CLI...");
+        var pluginTestPaths = [];
         shelljs.ls('plugins').forEach(function(plugin) {
           var potential_tests_plugin_xml = path.join('plugins', plugin, 'tests', 'plugin.xml');
           if (fs.existsSync(potential_tests_plugin_xml)) {
-            shelljs.exec(cli + " plugin add " + path.dirname(potential_tests_plugin_xml));
+            pluginTestPaths.push(path.dirname(potential_tests_plugin_xml));
           }
         });
+        shelljs.exec(cli + " plugin add " + pluginTestPaths.join(' '));
 
         popd();
     }