Add response warnings to audit logs (hashicorp#6386)

Author: jefferai

audit/format.go

@@ -371,6 +371,7 @@ func (f *AuditFormatter) FormatResponse(ctx context.Context, w io.Writer, config
 			Auth:     respAuth,
 			Secret:   respSecret,
 			Data:     resp.Data,
+			Warnings: resp.Warnings,
 			Redirect: resp.Redirect,
 			WrapInfo: respWrapInfo,
 			Headers:  resp.Headers,
@@ -426,6 +427,7 @@ type AuditResponse struct {
 	Auth     *AuditAuth             `json:"auth,omitempty"`
 	Secret   *AuditSecret           `json:"secret,omitempty"`
 	Data     map[string]interface{} `json:"data,omitempty"`
+	Warnings []string               `json:"warnings,omitempty"`
 	Redirect string                 `json:"redirect,omitempty"`
 	WrapInfo *AuditResponseWrapInfo `json:"wrap_info,omitempty"`
 	Headers  map[string][]string    `json:"headers"`