Fix test

server/src/main/java/org/apache/iotdb/db/metadata/MetadataConstant.java

@@ -27,8 +27,8 @@ public class MetadataConstant {
   public static final String ROOT = "root";
   public static final String METADATA_LOG = "mlog.txt";
   public static final String TAG_LOG = "tlog.txt";
-  public static final String MTREE_SNAPSHOT = "mtree.v1.snapshot";
-  public static final String MTREE_SNAPSHOT_TMP = "mtree.v1.snapshot.tmp";
+  public static final String MTREE_SNAPSHOT = "mtree-v1.snapshot";
+  public static final String MTREE_SNAPSHOT_TMP = "mtree-v1.snapshot.tmp";
 
 
   public static final short MNODE_TYPE = 0;

server/src/test/java/org/apache/iotdb/db/integration/IoTDBCreateSnapshotIT.java

@@ -68,7 +68,7 @@ public class IoTDBCreateSnapshotIT {
 
       // create snapshot
       statement.execute("CREATE SNAPSHOT FOR SCHEMA");
-      File snapshotFile = new File(config.getSchemaDir() + File.separator + "mtree.snapshot");
+      File snapshotFile = new File(config.getSchemaDir() + File.separator + "mtree-v1.snapshot");
 
       // test snapshot file exists
       Assert.assertTrue(snapshotFile.exists());