Fix expected error text in assertion.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/HDFS-1623@1230254 13f79535-47bb-0310-9956-ffa450edef68

hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestDFSRollback.java

@@ -248,7 +248,7 @@ public class TestDFSRollback extends TestCase {
       baseDirs = UpgradeUtilities.createNameNodeStorageDirs(nameNodeDirs, "previous");
       deleteMatchingFiles(baseDirs, "edits.*");
       startNameNodeShouldFail(StartupOption.ROLLBACK,
-          "No non-corrupt logs for txid ");
+          "Gap in transactions. Expected to be able to read up until at least txid ");
       UpgradeUtilities.createEmptyDirs(nameNodeDirs);
       
       log("NameNode rollback with no image file", numDirs);