Revert validation of the target param as an absolute path and allow it to be an
arbitrary string. This is so the
concat { <foo>: path => ... }
concat::fragment { ...: target => <foo> }
association may be symbolic as long as concat path param is specified. This
should resolve the symbolic name regression introduced in:
https://github.com/puppetlabs/puppetlabs-concat/commit/eaf84079
The use of $::id to set the default user/owner and group has caused
multiple bugs in the past, is incorrectly used to infer the egid,
introduces a dependency on the `id` fact, and provides no functionally
that can't be accomplished by passing `undef` or not setting the
respective params on the file & exec types.
A possible alternative would be to introduce a dep on the $::gid fact
but that would mean the entire module would depend on a version of
facter than hasn't shipped yet (unworkable) or to add a gid/egid fact
into this module (ugly).
