cmd/setec: be more deliberate about whitespace in text values #108
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Previously we added the --verbatim flag to override the default removal of
whitespace from plaintext secret values. I have now repeatedly tripped over
forgetting this default on PEM-formatted key values, so I propose we make it
harder to commit that error.
This change refines the check: If a value is not UTF-8, or does not have
leading or trailing whitespace, it is processed verbatim as before.
Now, however, if a UTF-8 value has leading or trailing whitespace, the user
must explicitly say what to do: Either set --verbatim to keep it, or set the
new --trim-space flag to remove it. Failing to set either flag reports an error
so the user does not get surprised.