ospf: forward ref. of areas for "max-metric router-lsa administrative" cmd

ospf: forward ref. of areas for "max-metric router-lsa administrative" cmd

In the event areas are created at a later point of time with respect
to the playback of the "max-metric router-lsa administrative" command,
those areas do not get into indefinite max-metric mode. This patch is
inteneded to store the configuration and apply it to all future areas
that may be created.

In the process, some other bugs that were there with respect to restart
etc are fixed up.

Tested locally to see that the fix works across multiple
areas and across multiple restarts.

Signed-off-by: Ayan Banerjee <ayan@cumulusnetworks.com>
Reviewed-by: Scott Feldman <sfeldma@cumulusnetworks.com>
Reviewed-by: JR Rivers <jrrivers@cumulusnetworks.com>
Signed-off-by: Scott Feldman <sfeldma@cumulusnetworks.com>