HADOOP-11184. Update Hadoop's lz4 to r123 (cmccabe)

LICENSE.txt

hadoop-common-project/hadoop-common/CHANGES.txt

hadoop-common-project/hadoop-common/pom.xml

...c/main/native/src/org/apache/hadoop/io/compress/lz4/lz4.c

...c/main/native/src/org/apache/hadoop/io/compress/lz4/lz4.h

...ative/src/org/apache/hadoop/io/compress/lz4/lz4_encoder.h

...main/native/src/org/apache/hadoop/io/compress/lz4/lz4hc.c

...main/native/src/org/apache/hadoop/io/compress/lz4/lz4hc.h

...ive/src/org/apache/hadoop/io/compress/lz4/lz4hc_encoder.h

...preduce-client/hadoop-mapreduce-client-nativetask/pom.xml

...e-client-nativetask/src/main/native/src/codec/Lz4Codec.cc

...lient-nativetask/src/main/native/test/TestCompressions.cc