Code refactor based on review comments

Author: shreyas-gopalakrishna

src/main/java/com/microsoft/azure/functions/worker/reflect/EnhancedClassLoaderProvider.java

@@ -19,21 +19,14 @@ public EnhancedClassLoaderProvider() {
      */
     @Override
     public ClassLoader createClassLoader() {
-        return createURLClassLoaderInstance();
-    }
-
-    /**
-     * Create and return a singleton URL classloader
-     * @return instance of URLClassLoader
-     */
-    private URLClassLoader createURLClassLoaderInstance() {
         if (classLoaderInstance == null) {
             synchronized (lock) {
                 if (classLoaderInstance == null) {
                     URL[] urlsForClassLoader = new URL[urls.size()];
                     urls.toArray(urlsForClassLoader);
-                    classLoaderInstance = new URLClassLoader(urlsForClassLoader);
-                    loadDrivers(classLoaderInstance);
+                    URLClassLoader loader = new URLClassLoader(urlsForClassLoader);
+                    loadDrivers(loader);
+                    classLoaderInstance = loader;
                 }
             }
         }