*: clean up unused vars, functions

With help from https://github.com/dominikh/go-unused.
IsNetTimeoutError seems useful, so moved to pkg/netutil.

client/auth_user.go

@@ -41,10 +41,6 @@ type UserRoles struct {
 	Roles []Role `json:"roles"`
 }
 
-type userName struct {
-	User string `json:"user"`
-}
-
 func v2AuthURL(ep url.URL, action string, name string) *url.URL {
 	if name != "" {
 		ep.Path = path.Join(ep.Path, defaultV2AuthPrefix, action, name)

client/keys_test.go

@@ -1246,7 +1246,6 @@ func TestHTTPKeysAPIGetResponse(t *testing.T) {
 func TestHTTPKeysAPIDeleteAction(t *testing.T) {
 	tests := []struct {
 		key        string
-		value      string
 		opts       *DeleteOptions
 		wantAction httpAction
 	}{