ospfd: RFC conformance test case 25.23 issue fix

ospfd: RFC conformance test case 25.23 issue fix

Problem Statement :
===================
LSA with InitialSequenceNumber is not originated
after MaxSequenceNumber.

ANVL Test case 25.33 states:
============================
As soon as this flooding of a LSA with LS sequence number
MaxSequenceNumber has been acknowledged by all adjacent neighbors,
a new instance can be originated with sequence number of InitialSequenceNumber.

RCA :
=====
DUT did not originated LSA with INITIAL_SEQUENCE number even
after receiving ACK for max sequence LSA.
Code is not present to handle this situation in the lsa ack flow.

Fix :
=====
Add code to originate LSA with initial sequence number in the
LSA ack flow in case of wrap around sequence number.

Signed-off-by: Mobashshera Rasool <mrasool@vmware.com>