s3: Add Alibaba OSS to integration tests and fix storage classes

docs/content/s3.md

@@ -1606,12 +1606,14 @@ acl> 1
 The storage class to use when storing new objects in OSS.
 Enter a string value. Press Enter for the default ("").
 Choose a number from below, or type in your own value
- 1 / Standard storage class
-   \ "Standard"
- 2 / Archive storage mode.
-   \ "Archive"
- 3 / Infrequent access storage mode.
-   \ "IA"
+ 1 / Default
+   \ ""
+ 2 / Standard storage class
+   \ "STANDARD"
+ 3 / Archive storage mode.
+   \ "GLACIER"
+ 4 / Infrequent access storage mode.
+   \ "STANDARD_IA"
 storage_class> 1
 Edit advanced config? (y/n)
 y) Yes