builder: remove deprecated context usage

builder/digitalocean/builder.go

@@ -36,7 +36,7 @@ func (b *Builder) Prepare(raws ...interface{}) ([]string, error) {
 }
 
 func (b *Builder) Run(ctx context.Context, ui packer.Ui, hook packer.Hook) (packer.Artifact, error) {
-	client := godo.NewClient(oauth2.NewClient(oauth2.NoContext, &apiTokenSource{
+	client := godo.NewClient(oauth2.NewClient(context.TODO(), &apiTokenSource{
 		AccessToken: b.config.APIToken,
 	}))
 	if b.config.APIURL != "" {

builder/googlecompute/driver_gce.go

@@ -78,7 +78,7 @@ func NewClientGCE(conf *jwt.Config, vaultOauth string) (*http.Client, error) {
 		// Auth with Vault Oauth
 		log.Printf("Using Vault to generate Oauth token.")
 		ts := OauthTokenSource{vaultOauth}
-		return oauth2.NewClient(oauth2.NoContext, ts), nil
+		return oauth2.NewClient(context.TODO(), ts), nil
 
 	} else if conf != nil && len(conf.PrivateKey) > 0 {
 		// Auth with AccountFile if provided
@@ -90,10 +90,10 @@ func NewClientGCE(conf *jwt.Config, vaultOauth string) (*http.Client, error) {
 		// Initiate an http.Client. The following GET request will be
 		// authorized and authenticated on the behalf of
 		// your service account.
-		client = conf.Client(oauth2.NoContext)
+		client = conf.Client(context.TODO())
 	} else {
 		log.Printf("[INFO] Requesting Google token via GCE API Default Client Token Source...")
-		client, err = google.DefaultClient(oauth2.NoContext, DriverScopes...)
+		client, err = google.DefaultClient(context.TODO(), DriverScopes...)
 		// The DefaultClient uses the DefaultTokenSource of the google lib.
 		// The DefaultTokenSource uses the "Application Default Credentials"
 		// It looks for credentials in the following places, preferring the first location found: