DMS token callback
I would very much like to have a token callback in DMSOpenOptions, to be used as an alternative to supplying fixed strings.
I only need this for C++. Where I believe it is trivial to implement.
My application already uses the DMS for other purposes, and has proprietary code to manage tokens. Including refreshing them every hour. There isn't really any way of extending that to OpenVDS without exposing SDManager::setAuthProviderCallback().
Suggested implementation in tokencb.patch