Clean up cp tests

Signed-off-by: Raul Gutierrez S <rgs@itevenworks.net>
Fix off-by-one for summary of /

Signed-off-by: Raul Gutierrez S <rgs@itevenworks.net>
Fix async cp

Allow recursive option to StatMap and use that for
async cp from zk to zk. Remove AsyncWalker since
it was a broken version of StatMap.

Signed-off-by: Raul Gutierrez S <rgs@itevenworks.net>
Update CHANGES.md

Signed-off-by: Raul Gutierrez S <rgs@itevenworks.net>