SQOOP-2145, hcat binary script doesn't do smart detection of HBASE_HOME. It assumes it's always located in /usr/lib/hbase and if not HBASE_HOME variable needs to be exported. The reason is often times people have tarballs like ~/hive-hcatalog, ~/hbase, etc. and it would be good to have their hcat scripts work out of the book.
This doesn't regress anything because it only sets the HBASE_HOME if it's not already set and the directory it's setting it to exists and is valid.