Remove 'Swift 3.1.1' from build. (#2737)
Remove 'Swift 3.1.1' from build. (#2737)

Swift 3.1.1 build is safe to remove, since we're not running any tests there anyway and it buys 4 minutes of time in the process.
devbv/incubator-openwhisk,cbickel/openwhisk,markusthoemmes/openwhisk,cbickel/openwhisk,devbv/incubator-openwhisk,RSulzmann/openwhisk,markusthoemmes/openwhisk,akrabat/openwhisk,houshengbo/openwhisk,cbickel/openwhisk,jeremiaswerner/openwhisk,sven-lange-last/openwhisk,jeremiaswerner/openwhisk,csantanapr/incubator-openwhisk,openwhisk/openwhisk,openwhisk/openwhisk,dubeejw/openwhisk,rabbah/openwhisk,sven-lange-last/openwhisk,houshengbo/openwhisk,akrabat/openwhisk,duynguyen/incubator-openwhisk,cbickel/openwhisk,rabbah/openwhisk,dubeejw/openwhisk,sven-lange-last/openwhisk,cbickel/openwhisk,dubeejw/openwhisk,tysonnorris/openwhisk,jasonpet/openwhisk,dubeejw/openwhisk,jeremiaswerner/openwhisk,devbv/incubator-openwhisk,rabbah/openwhisk,jeremiaswerner/openwhisk,dubeejw/openwhisk,paulcastro/openwhisk,tysonnorris/openwhisk,akrabat/openwhisk,akrabat/openwhisk,jasonpet/openwhisk,markusthoemmes/openwhisk,jasonpet/openwhisk,paulcastro/openwhisk,jeremiaswerner/openwhisk,houshengbo/openwhisk,jasonpet/openwhisk,devbv/incubator-openwhisk,duynguyen/incubator-openwhisk,csantanapr/incubator-openwhisk,duynguyen/incubator-openwhisk,rabbah/openwhisk,openwhisk/openwhisk,openwhisk/openwhisk,rabbah/openwhisk,style95/openwhisk,jeremiaswerner/openwhisk,paulcastro/openwhisk,jasonpet/openwhisk,akrabat/openwhisk,starpit/openwhisk,tysonnorris/openwhisk,csantanapr/incubator-openwhisk,RSulzmann/openwhisk,markusthoemmes/openwhisk,csantanapr/incubator-openwhisk,markusthoemmes/openwhisk,style95/openwhisk,csantanapr/incubator-openwhisk,jasonpet/openwhisk,duynguyen/incubator-openwhisk,rabbah/openwhisk,csantanapr/incubator-openwhisk,tysonnorris/openwhisk,dubeejw/openwhisk,RSulzmann/openwhisk,csantanapr/incubator-openwhisk,markusthoemmes/openwhisk,tysonnorris/openwhisk,RSulzmann/openwhisk,paulcastro/openwhisk,akrabat/openwhisk,starpit/openwhisk,tysonnorris/openwhisk,openwhisk/openwhisk,jeremiaswerner/openwhisk,houshengbo/openwhisk,sven-lange-last/openwhisk,paulcastro/openwhisk,cbickel/openwhisk,paulcastro/openwhisk,devbv/incubator-openwhisk,starpit/openwhisk,starpit/openwhisk,houshengbo/openwhisk,houshengbo/openwhisk,RSulzmann/openwhisk,openwhisk/openwhisk,markusthoemmes/openwhisk,akrabat/openwhisk,houshengbo/openwhisk,tysonnorris/openwhisk,markusthoemmes/openwhisk,RSulzmann/openwhisk,sven-lange-last/openwhisk,starpit/openwhisk,RSulzmann/openwhisk,style95/openwhisk,paulcastro/openwhisk,sven-lange-last/openwhisk,style95/openwhisk,style95/openwhisk,starpit/openwhisk,duynguyen/incubator-openwhisk,jasonpet/openwhisk,sven-lange-last/openwhisk,rabbah/openwhisk,cbickel/openwhisk,style95/openwhisk,style95/openwhisk