conf: domain: Invoke post-parse callbacks after parsing private XML parts

conf: domain: Invoke post-parse callbacks after parsing private XML parts

When parsing status XML the post-parse callbacks can't access any
private data present in the status XML as the private bits were parsed
after invoking post-parse callbacks.

Move the invocation so that everything is parsed first.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>