This change affects the update process (either using cmk-update-config or omd update).
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 the user may be prompted for input.
In the past, if the user typed any input other than c, continue, d, disable, then the update would be aborted.
This would lead to an aborted update in case of simple typos such as contnue.
With this Werk, the update only accepts the following for input strings: a, abort, c, continue, d, disable.
If anything else is typed, then the user will be prompted repeatedly until some valid input is provided.
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