SE-91 increase excepted time difference because file system is NFS

SVN: 7678

common/sourceTest/java/ch/systemsx/cisd/common/utilities/FileUtilitiesLastChangedTest.java

@@ -107,7 +107,7 @@ public class FileUtilitiesLastChangedTest
         }
         final long lastChanged = FileUtilities.lastChanged(testDir);
         final long diff = Math.abs(lastChanged - now);
-        assert diff <= 2000 : "expected difference less than 2s, but was " + diff / 1000.0 + "s";
+        assert diff <= 2500 : "expected difference less than 2.5s, but was " + diff / 1000.0 + "s";
 
         // We need to wait for more than 1s because that's the granularity of the changed time
         // attribute saved with