Add generated file

This PR adds generated files under pkg/client and vendor folder.

vendor/github.com/googleapis/gnostic/apps/disco/README.md

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+# disco
+
+This directory contains a tool for working with Google's Discovery API and Discovery Format,
+including the ability to convert Discovery Format descriptions to OpenAPI.
+
+Installation:
+
+        go get github.com/googleapis/gnostic
+        go install github.com/googleapis/gnostic/apps/disco
+  
+  
+Usage:
+
+        disco help
+
+Prints a list of commands and options.
+
+        disco list [--raw]
+        
+Calls the Google Discovery API and lists available APIs. 
+The `--raw` option prints the raw results of the Discovery List APIs call.
+
+        disco get [<api>] [<version>] [--raw] [--openapi2] [--openapi3] [--features] [--schemas] [--all]
+        
+Gets the specified API and version from the Google Discovery API.
+`<version>` can be omitted if it is unique.
+The `--raw` option saves the raw Discovery Format description.
+The `--openapi2` option rewrites the API description in OpenAPI v2.
+The `--openapi3` option rewrites the API description in OpenAPI v3.
+The `--features` option displays the contents of the `features` sections of discovery documents.
+The `--schemas` option displays information about the schemas defined for the API.
+The `--all` option runs the other associated operations for all of the APIs available from the Discovery Service. 
+When `--all` is specified, `<api>` and `<version>` should be omitted.
+
+        disco <file> [--openapi2] [--openapi3] [--features] [--schemas]
+
+Applies the specified operations to a local file. See the `get` command for details.
+