CONFIG REWRITE: don't add the signature if it already exists.
At the end of the file, CONFIG REWRITE adds a comment line that:
# Generated by CONFIG REWRITE
Followed by the additional config options required. However this was
added again and again at every rewrite in praticular conditions (when a
given set of options change in a given time during the time).
Now if it was alrady encountered, it is not added a second time.
This is especially important for Sentinel that rewrites the config at
every state change.
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