Add path autocomplete for `du`
Add path autocomplete for `du`

Signed-off-by: Raul Gutierrez S <f25f6873bbbde69f1fe653b3e6bd40d543b8d0e0@itevenworks.net>

rgs1/zk_shell,harlowja/zk_shell,rgs1/zk_shell,harlowja/zk_shell