Fix AccumuloVFSClassLoader race condition

localLoader was never set if another thread initilaized loader

Author: BukrosSzabolcs

start/src/main/java/org/apache/accumulo/start/classloader/vfs/AccumuloVFSClassLoader.java

@@ -244,6 +244,8 @@ private static ClassLoader getClassLoader_Internal() throws IOException {
             }
           }
 
+        } else {
+          localLoader = loader;
         }
       }
     }