lib: Add a Dev catch for when a timer is set for > 1 year

lib: Add a Dev catch for when a timer is set for > 1 year

Since there are timers that are created based upon doing some
math and we know that unsigned values when doing math and we accidently
subtract a larger number from a smaller number causes the unsigned
number to wrap to very large numbers, let's put in a small catch
in place to see if there are any places in the system that
mistakes are made and FRR is accidently creating a problem
for itself.

Signed-off-by: Donald Sharp <sharpd@nvidia.com>