HADOOP-11283. SequenceFile.Writer can leak file descriptors in DistCpV1#setup(). (Contributed by Varun Saxena via ozawa)

(cherry picked from commit a164ce2ac985ecac957362fc717640ad45449371)
HADOOP-11448. Fix findbugs warnings in FileBasedIPList. (ozawa)

(cherry picked from commit 399d25884a99f3e0b2ef65eaf9f3149d0d523f13)
Merge remote-tracking branch 'remotes/origin/branch-2' into branch-2