coroparse: Store key with prefix for nodelist.node

Config file like:

nodelist {
  node {
    nodeid: 1
    subsection {
      nodeid: 2
    }
  }
...

was parsed incorrectly and subsection nodeid (2) was used instead of
node section nodeid (1).

Solution is to properly check key path instead of just key name and
use key path - "nodelist.node." prefix as new key name.

Signed-off-by: Jan Friesse <jfriesse@redhat.com>
Reviewed-by: Christine Caulfield <ccaulfie@redhat.com>