[Tests] Fix RetryHttpInitializerWrapperTests.testIOExceptionRetry

This commit gives more time to the IO exception handler to retry the
request.

plugins/discovery-gce/src/test/java/org/elasticsearch/discovery/gce/RetryHttpInitializerWrapperTests.java

@@ -160,7 +160,7 @@ public class RetryHttpInitializerWrapperTests extends ESTestCase {
                 .build();
         MockSleeper mockSleeper = new MockSleeper();
         RetryHttpInitializerWrapper retryHttpInitializerWrapper = new RetryHttpInitializerWrapper(credential, mockSleeper,
-            TimeValue.timeValueMillis(500));
+            TimeValue.timeValueSeconds(30L));
 
         Compute client = new Compute.Builder(fakeTransport, new JacksonFactory(), null)
                 .setHttpRequestInitializer(retryHttpInitializerWrapper)