When using a `show vitess_shards like 'keyspace1/%'` filter, actually use the keyspace part of the query to limit the keyspaces for which we fetch all shards, instead of getting all shards from all keyspaces the vtgate knows about and then filtering them out. This probably does not matter unless you have a lot of shards and/or are running `show vitess_shards` like this frequently.
When using a `show vitess_shards like 'keyspace1/%'`
filter, actually use the keyspace part of the query to limit the
keyspaces for which we fetch all shards, instead of getting all
shards from all keyspaces the vtgate knows about and then
filtering them out. This probably does not matter unless you
have a lot of shards and/or are running `show vitess_shards`
like this frequently.

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

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