test/schema.py: Add test to reproduce PreflightSchema issue that previous SQL statements within the same ApplySchema command are not considered.
test/schema.py: Add test to reproduce PreflightSchema issue that previous SQL statements within the same ApplySchema command are not considered.

For example, ApplySchema could DROP and then CREATE a table. Since the DROP is not considered during preflight, CREATE will fail with the error that the table already exists.

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