Fix physical walk on acl module for Linux
Fix physical walk on acl module for Linux

`-h` is for BSD [1] while `-P`/`--physical` is for Linux [2].
This commit fixes that option now that acl module is (temporarily)
only supported for Linux.
I will re-add `-h` when fixing BSD support.

[1]: http://www.freebsd.org/cgi/man.cgi?format=html&query=setfacl(1)
[2]: http://linuxcommand.org/man_pages/setfacl1.html

thaim/ansible,thaim/ansible