autopilotserver/rpc: add feature config

This commit adds a field to the autopilot server rpc that transports
default configurations from autopilot to litd.

Author: bitromortac

autopilotserver/client.go

@@ -357,10 +357,11 @@ func (c *Client) ListFeatures(ctx context.Context) (map[string]*Feature,
 		perms := unmarshalPermissions(feature.PermissionsList)
 		rules := unmarshalRules(feature.Rules)
 		features[i] = &Feature{
-			Name:        feature.Name,
-			Description: feature.Description,
-			Permissions: perms,
-			Rules:       rules,
+			Name:          feature.Name,
+			Description:   feature.Description,
+			Permissions:   perms,
+			Rules:         rules,
+			DefaultConfig: feature.DefaultConfig,
 		}
 	}
 

autopilotserver/interface.go

@@ -68,6 +68,11 @@ type Feature struct {
 	// Rules is a list of all the firewall that must be specified for this
 	// feature.
 	Rules map[string]*RuleValues
+
+	// DefaultConfig is a JSON-serialized configuration of the feature. It
+	// represents the default configuration we can use if the user doesn't
+	// specify any.
+	DefaultConfig []byte
 }
 
 // RuleValues holds the default value along with the sane max and min values