Made error_code and message repeated

Author: xing-yang

csi.proto

@@ -1358,11 +1358,11 @@ message VolumeHealth {
   // The error code describing the health condition of the volume.
   // This is an opaque field to CO.
   // This field is REQUIRED.
-  string error_code = 2;
+  repeated string error_code = 2;
 
-  // The error message associated with the above error_code.
+  // The error messages associated with the above error codes.
   // This field is OPTIONAL.
-  string message = 3;
+  repeated string message = 3;
 }
 message NodeGetCapabilitiesRequest {
   // Intentionally empty.

lib/go/csi/csi.pb.go

@@ -2366,11 +2366,11 @@ message VolumeHealth {
   // The error code describing the health condition of the volume.
   // This is an opaque field to CO.
   // This field is REQUIRED.
-  string error_code = 2;
+  repeated string error_code = 2;
 
-  // The error message associated with the above error_code.
+  // The error messages associated with the above error codes.
   // This field is OPTIONAL.
-  string message = 3;
+  repeated string message = 3;
 }
 ```