move cf-binaries to sbin
The ppkeys permission directory is wrong, see issue:
 * https://github.com/Webhuis/Cfengine-debian/issues/28
 * Some directories must be 700 for cfengine.
Merge pull request #33 from basvandervlies/set_directory_permissions

Restrict permission for some directories, see issue:
Merge pull request #32 from basvandervlies/cf_binaries_sbin

move cf-binaries to sbin