Fix how to build tar ball.. its assembly:single now instead of assembly:assembly

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1470814 13f79535-47bb-0310-9956-ffa450edef68
HBASE-7704 migration tool that checks presence of HFile V1 files

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1470818 13f79535-47bb-0310-9956-ffa450edef68