ospfd/ospfd.h: Change delay and holdtime to 1s. More appropriate values for

ospfd/ospfd.h: Change delay and holdtime to 1s. More appropriate values for
the class of machines which zebra runs on than the original defaults which
were taken from IOS (and even IOS uses much lower times these days). Lower
values greatly help with convergence.

Ideally, we'd use even lower times, but thread_add_timer() api will need to
be modified to use milliseconds. (eg JunOS uses 100ms for delay, and 700ms
for hold time, iirc from Hasso).