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cvsclient: Do not abort checkout when skipping $Log$ keyword expansion

Description

cvsclient: Do not abort checkout when skipping $Log$ keyword expansion

Some CVS servers have restriction regarding the expansion of the $Log$
keyword in file to checkout and might skip that operation.

Nevertheless, official CVS client will still checkout the file but
without expanding the $Log$ keyword so we should have the same behavior
in the loader.

Closes T4646