Fix vtexplain race by waiting around for the fakesqldb tabletserver instances to exit cleanly.  Fixes #5474
Fix vtexplain race by waiting around for the fakesqldb tabletserver
instances to exit cleanly.  Fixes #5474

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

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