tadukurow

Add fix for BSD stat

2

Current implementation assumes GNU coreutils version of stat, which fails on BSD. Try BSD format if GNU coreutils version fails. fixes #501

[98 in chef-provisioning/lib/chef/provisioning/machine/unix_machine.rb](https://github.com/chef/chef-provisioning/blob/master/lib/chef/provisioning/machine/unix_machine.rb#L98) calls `result = transport.execute("stat -c '%a %U %G %n' #{path}", :read_only => true)` FreeBSD stat doesn't have the "-c" flag and convergence fails. https://www.freebsd.org/cgi/man.cgi?query=stat&sektion=1