tests: Topotests are not giving sufficient time to propagate data

tests: Topotests are not giving sufficient time to propagate data

A bunch of our current tests setup data and redistribute
it across some bgp connections and then test for it
being there.  A delay of 2 seconds that was initially
there to ensure that the data has propagated does not
actually work all the time when you have a loaded
virtualized environment.

Make the sleep 10 seconds.  I agree this is not the ideal
solution but I would rather get the damn tests up and running
again.

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