vtgate/buffer: Fix bug that keyspaces were not logged at startup.
vtgate/buffer: Fix bug that keyspaces were not logged at startup.

This happened only when shards were included as well.

applift/vitess,mattharden/vitess,davygeek/vitess,enisoc/vitess,tinyspeck/vitess,tirsen/vitess,vitessio/vitess,sougou/vitess,vitessio/vitess,tinyspeck/vitess,rnavarro/vitess,pivanof/vitess,applift/vitess,davygeek/vitess,vitessio/vitess,davygeek/vitess,dcadevil/vitess,pivanof/vitess,mahak/vitess,pivanof/vitess,applift/vitess,enisoc/vitess,sougou/vitess,davygeek/vitess,rnavarro/vitess,HubSpot/vitess,rnavarro/vitess,alainjobart/vitess,alainjobart/vitess,applift/vitess,enisoc/vitess,HubSpot/vitess,enisoc/vitess,applift/vitess,mahak/vitess,tinyspeck/vitess,rnavarro/vitess,mahak/vitess,sougou/vitess,rnavarro/vitess,mattharden/vitess,alainjobart/vitess,tinyspeck/vitess,tirsen/vitess,HubSpot/vitess,dcadevil/vitess,rnavarro/vitess,dcadevil/vitess,rnavarro/vitess,dcadevil/vitess,enisoc/vitess,vitessio/vitess,tirsen/vitess,mahak/vitess,mahak/vitess,sougou/vitess,tinyspeck/vitess,sougou/vitess,rnavarro/vitess,HubSpot/vitess,dcadevil/vitess,alainjobart/vitess,mattharden/vitess,sougou/vitess,tinyspeck/vitess,davygeek/vitess,HubSpot/vitess,vitessio/vitess,mattharden/vitess,tirsen/vitess,mattharden/vitess,alainjobart/vitess,applift/vitess,alainjobart/vitess,tirsen/vitess,davygeek/vitess,davygeek/vitess,tirsen/vitess,mahak/vitess,mattharden/vitess,pivanof/vitess,mattharden/vitess,vitessio/vitess,applift/vitess,sougou/vitess,vitessio/vitess,sougou/vitess,applift/vitess,mahak/vitess,dcadevil/vitess,enisoc/vitess,rnavarro/vitess,pivanof/vitess,pivanof/vitess,tirsen/vitess,mattharden/vitess,alainjobart/vitess,tirsen/vitess,applift/vitess,pivanof/vitess,HubSpot/vitess,tinyspeck/vitess,vitessio/vitess,mahak/vitess,HubSpot/vitess,pivanof/vitess,HubSpot/vitess,mattharden/vitess,applift/vitess,mattharden/vitess,enisoc/vitess,pivanof/vitess,alainjobart/vitess,dcadevil/vitess,tirsen/vitess