HADOOP-17703. checkcompatibility.py errors out when specifying annotations. (#3017)

Reviewed-by: Akira Ajisaka <aajisaka@apache.org>
(cherry picked from commit 110cda3de63e1e483c207085207f5d73d7b8adfd)
(cherry picked from commit 0df47432847e1a8b9f3cd31d60b3003fc5a8bc9b)

dev-support/bin/checkcompatibility.py

@@ -175,7 +175,7 @@ def run_java_acc(src_name, src_jars, dst_name, dst_jars, annotations):
 
   if annotations is not None:
     annotations_path = os.path.join(get_scratch_dir(), "annotations.txt")
-    with file(annotations_path, "w") as f:
+    with open(annotations_path, "w") as f:
       for ann in annotations:
         print(ann, file=f)
     args += ["-annotations-list", annotations_path]