HDFS-13770. dfsadmin -report does not always decrease "missing blocks (with replication factor 1)" metrics when file is deleted. Contributed by Kitti Nanasi.
Signed-off-by: Wei-Chiu Chuang <weichiu@apache.org>
(cherry picked from commit abd11f9db1aaffeb864cca9f336f3d169d264836)
(cherry picked from commit 39e47dacaef4a8908ff43975957cb8fe3eb29db2)