HADOOP-9319. Update bundled LZ4 source to r99. (Binglin Chang via llu)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1510735 13f79535-47bb-0310-9956-ffa450edef68
merge -c 1510772 FIXES: HADOOP-9816.  RPC Sasl QOP is broken (daryn)


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1510774 13f79535-47bb-0310-9956-ffa450edef68
HDFS-4905. Merging change r1510773 from trunk to branch-2.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1510780 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/branch-2' into branch-2-gd
Merge remote branch 'origin/branch-2-gd' into fb-HADOOP-9166-branch-2-gd