HDFS-7385. ThreadLocal used in FSEditLog class causes FSImage permission mess up. Contributed by jiangyu.

(cherry picked from commit b0a41de68c5b08f534ca231293de053c0b0cbd5d)
(cherry picked from commit 4e9001530f7bc414b43723858cf7984f707b30e0)
(cherry picked from commit ed2a4db6d4dbb1e0a2d589dda9cdea281e8e5d39)
4 files changed