Roll back autorest to v8.1.0

This is the last working version of autorest with the new swagger client libs. 

See:

- https://github.com/Azure/go-autorest/blob/1f7cd6cfe0adea687ad44a512dfe76140f804318/autorest/retriablerequest.go
- https://github.com/Azure/go-autorest/blob/1f7cd6cfe0adea687ad44a512dfe76140f804318/autorest/retriablerequest_1.8.go
- https://github.com/Azure/go-autorest/blob/master/CHANGELOG.md#v810
- https://godoc.org/github.com/Azure/go-autorest/autorest#RetriableRequest
-

Author: bcomnes

go.mod

@@ -3,26 +3,42 @@ module github.com/netlify/open-api
 go 1.12
 
 require (
-	contrib.go.opencensus.io/exporter/ocagent v0.4.6 // indirect
-	github.com/Azure/go-autorest v11.5.0+incompatible
+	github.com/Azure/go-autorest v8.1.0+incompatible
+	github.com/BurntSushi/toml v0.3.1 // indirect
+	github.com/PuerkitoBio/purell v1.1.1 // indirect
 	github.com/cenkalti/backoff v2.1.1+incompatible
 	github.com/dgrijalva/jwt-go v3.2.0+incompatible // indirect
+	github.com/go-openapi/analysis v0.18.0 // indirect
 	github.com/go-openapi/errors v0.18.0
 	github.com/go-openapi/inflect v0.18.0 // indirect
+	github.com/go-openapi/jsonpointer v0.18.0 // indirect
+	github.com/go-openapi/jsonreference v0.18.0 // indirect
+	github.com/go-openapi/loads v0.18.0 // indirect
 	github.com/go-openapi/runtime v0.18.0
+	github.com/go-openapi/spec v0.18.0 // indirect
 	github.com/go-openapi/strfmt v0.18.0
 	github.com/go-openapi/swag v0.18.0
 	github.com/go-openapi/validate v0.18.0
 	github.com/go-swagger/go-swagger v0.18.0
+	github.com/go-swagger/scan-repo-boundary v0.0.0-20180623220736-973b3573c013 // indirect
+	github.com/google/uuid v1.1.1 // indirect
 	github.com/gorilla/handlers v1.4.0 // indirect
 	github.com/jessevdk/go-flags v1.4.0 // indirect
+	github.com/konsorten/go-windows-terminal-sequences v1.0.2 // indirect
 	github.com/kr/pretty v0.1.0 // indirect
-	github.com/kyoh86/richgo v0.3.0 // indirect
+	github.com/kyoh86/richgo v0.3.0
+	github.com/kyoh86/xdg v1.0.0 // indirect
+	github.com/mailru/easyjson v0.0.0-20190221075403-6243d8e04c3f // indirect
+	github.com/mattn/go-isatty v0.0.6 // indirect
 	github.com/rsc/goversion v1.2.0
 	github.com/sirupsen/logrus v1.3.0
+	github.com/spf13/afero v1.2.1 // indirect
 	github.com/spf13/viper v1.3.1 // indirect
-	github.com/stretchr/testify v1.2.2
+	github.com/stretchr/testify v1.3.0
 	github.com/toqueteos/webbrowser v1.1.0 // indirect
-	go.opencensus.io v0.19.0 // indirect
+	golang.org/x/crypto v0.0.0-20190225124518-7f87c0fbb88b // indirect
 	golang.org/x/net v0.0.0-20190226215741-afe646ca25a4
+	golang.org/x/sys v0.0.0-20190226215855-775f8194d0f9 // indirect
+	golang.org/x/text v0.3.1-0.20180807135948-17ff2d5776d2 // indirect
+	golang.org/x/tools v0.0.0-20190114222345-bf090417da8b // indirect
 )