Werk #16408: omd update: Allow Aborting Before "Completed verifying site configuration."

Sites may have configuration, MKPs and other local files, which are incompatible with the version targeted by omd update. If such a problem occurs, then aborting the update may be necessary. In earlier versions, users were advised to perform a downgrade, which was not user-friendly and had several pitfalls. Downgrading is not supported as it has many potential downsides. With this Werk, omd update is better able to deal with these situations. omd update will show the message

Completed verifying site configuration. Your site now has version {target version}.

If the update is aborted before this message is shown, then the site is restored to it's previous state. This includes selecting the abort option, unexpected internal errors, or aborting the update using CTRL-C.

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