nispor: delete ip addr not in desired state

Previously, new IP addr on same interface was being appended to
addresses list instead of being updated.

This solution asks nispor to delete ip addresses in the current state not contained in the
desired state.

Resolves: https://issues.redhat.com/browse/RHEL-54544

Signed-off-by: Rahul Rajesh <rajeshrah22@gmail.com>