Simplify stale topo serving codepath. We will now also serve stale topo while the topo cache is refreshing.
Simplify stale topo serving codepath. We will now also serve stale topo
while the topo cache is refreshing.

Signed-off-by: Jacques Grove <cd08d3adda01607dd857ba479d6e291b9b358911@gmail.com>

mahak/vitess,vitessio/vitess,tinyspeck/vitess,mahak/vitess,tinyspeck/vitess,vitessio/vitess,tinyspeck/vitess,vitessio/vitess,vitessio/vitess,mahak/vitess,vitessio/vitess,vitessio/vitess,tinyspeck/vitess,mahak/vitess,vitessio/vitess,mahak/vitess,tinyspeck/vitess,tinyspeck/vitess,mahak/vitess,mahak/vitess,vitessio/vitess,mahak/vitess,tinyspeck/vitess