Update swagger for missing secret definitions

- added secret definition and removed types used previously

Remove structs for secrets

- after discussion on PR the core contributors decided we just
want simple CRUD with the Secret type.

Signed-off-by: Alex Ellis (VMware) <alexellis2@gmail.com>

gateway/requests/requests.go

@@ -91,24 +91,8 @@ type DeleteFunctionRequest struct {
 	FunctionName string `json:"functionName"`
 }
 
-// SecretInfo payload for PUT,POST secret w/ annotations
-type SecretInfo struct {
-	Secret      Secret            `json:"secret"`
-	Annotations map[string]string `json:"annotations,omitempty"`
-}
-
-// ListSecretsResponse GET response for secrets (value omitted)
-type ListSecretsResponse struct {
-	Secrets []SecretInfo `json:"secrets"`
-}
-
-// DeleteSecretRequest remote a secret by name
-type DeleteSecretRequest struct {
-	SecretName string `json:"secretName"`
-}
-
-// Secret schema use Value only in PUT,POST http verbs
+// Secret for underlying orchestrator
 type Secret struct {
 	Name  string `json:"name"`
-	Value string `json:"value,omitempty"` // write-only, base64
+	Value string `json:"value,omitempty"`
 }