deprecate/remove global WORM mode (#9436)

global WORM mode is a complex piece for which
the time has passed, with the advent of S3 compatible
object locking and retention implementation global
WORM is sort of deprecated, this has been mentioned
in our documentation for some time, now the time
has come for this to go.

cmd/web-handlers.go

@@ -745,17 +745,6 @@ next:
 			}
 
 			apiErr := ErrNone
-			// Deny if global WORM is enabled
-			if globalWORMEnabled {
-				opts, err := getOpts(ctx, r, args.BucketName, objectName)
-				if err != nil {
-					apiErr = toAPIErrorCode(ctx, err)
-				} else {
-					if _, err := getObjectInfo(ctx, args.BucketName, objectName, opts); err == nil {
-						apiErr = ErrMethodNotAllowed
-					}
-				}
-			}
 			if _, ok := globalBucketObjectLockConfig.Get(args.BucketName); ok && (apiErr == ErrNone) {
 				apiErr = enforceRetentionBypassForDeleteWeb(ctx, r, args.BucketName, objectName, getObjectInfo)
 				if apiErr != ErrNone && apiErr != ErrNoSuchKey {
@@ -909,11 +898,6 @@ func (web *webAPIHandlers) SetAuth(r *http.Request, args *SetAuthArgs, reply *Se
 		return toJSONError(ctx, authErr)
 	}
 
-	// When WORM is enabled, disallow changing credenatials for owner and user
-	if globalWORMEnabled {
-		return toJSONError(ctx, errChangeCredNotAllowed)
-	}
-
 	if owner {
 		// Owner is not allowed to change credentials through browser.
 		return toJSONError(ctx, errChangeCredNotAllowed)