build: rename artifact to apache-hadoop

Change to name the output artifact of the build
apache-hadoop.tgz rather than hadoop.tgz

Signed-off-by: Joe Buck <jbbuck@gmail.com>
build: do not copy libcephfs.jar into build

Removing code that copies the libcephfs
jar file into the build since that jar is not
needed for building the stock Apache Hadoop repo.

Signed-off-by: Joe Buck <jbbuck@gmail.com>