ospfd: packet fifo init in interface create

ospfd: packet fifo init in interface create

Currently, interface packet transmit queue is created/deleted
as part of Interface UP/Down event. This results in
a rare condition where port came up but queue
was not created. The creation of queue occupies only few bytes.

Moving fifo queue creation to interface create
would add few bytes of fifo creation but at least it guaranteed
to be available during Up/down -->Up event.

Initialize ospf packet fifo queue during ospf
interface creation.

Drain queue during interface down event.

Drained and free the queue as part of the interface
delete/cleanup.

Ticket:CM-20744
Testing Done:

Bring up ospfv2 topology with multiple neighbors.
1) Trigger multiple shut/no shut events and validate
all queues are freed.
2) configure/deconfigure router ospf and validate
all ospf instance and interface underneath are freed.

Signed-off-by: Chirag Shah <chirag@cumulusnetworks.com>