Suppress Eclipse warnings about not closed resources

Change-Id: I78e8f1d5d1df7dc77c608569cd6bdb381f5fa348

gerrit-pgm/src/main/java/com/google/gerrit/pgm/init/InitPluginStepsLoader.java

@@ -64,9 +64,11 @@ public class InitPluginStepsLoader {
 
   private InitStep loadInitStep(File jar) {
     try {
+      @SuppressWarnings("resource")
       ClassLoader pluginLoader =
           new URLClassLoader(new URL[] {jar.toURI().toURL()},
               InitPluginStepsLoader.class.getClassLoader());
+      @SuppressWarnings("resource")
       JarFile jarFile = new JarFile(jar);
       Attributes jarFileAttributes = jarFile.getManifest().getMainAttributes();
       String initClassName = jarFileAttributes.getValue("Gerrit-InitStep");

gerrit-pgm/src/main/java/com/google/gerrit/pgm/util/IoUtil.java

@@ -57,6 +57,7 @@ public final class IoUtil {
     if (!(cl instanceof URLClassLoader)) {
       throw noAddURL("Not loaded by URLClassLoader", null);
     }
+    @SuppressWarnings("resource")
     URLClassLoader urlClassLoader = (URLClassLoader) cl;
 
     Method addURL;