change test to IT in file and class names

Author: whuffman36

samples/snippets/src/test/java/com/example/bigquery/SetCustomRetryAlgorithmIT.java

@@ -26,7 +26,7 @@
 import org.junit.Before;
 import org.junit.Test;
 
-public class SetCustomRetryAlgorithmTest {
+public class SetCustomRetryAlgorithmIT {
   private final Logger log = Logger.getLogger(this.getClass().getName());
   private ByteArrayOutputStream bout;
   private PrintStream out;