Accept short acls.

[kevincox]

They appear to work but I get a warning bellow unless all the acl's are in long form.

Notice: /Stage[main]/Srv/Acl[/srv/]/permission: permission changed 'default:group::r-x,default:other::--x,default:user::rwx,group::r-x,other::--x,user::rwx' to 'u::rwx,g::r-x,o::--x,d:u::rwx,d:g::r-x,d:o::--x'

It would be nice to be able to use d:u::rx for example, without generating this warning. This form is accepted by the setfacl command so it is standard.

[dobbymoodge]

Not sure when I will have time to work on this, but it is a known issue: https://github.com/dobbymoodge/puppet-acl/blob/master/lib/puppet/type/acl.rb#L138

If you come up with a pull request I'd be happy to add it.