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This is a fairly major overhaul to greatly reduce the number of
redundant code paths. We here created a new process_keys_for_file
function that processes key from a userid for a given key file. All
the main top elevel functions now call this one function.
The main top level monkeysphere functions for updating the user's
authorized_keys and known_hosts files are now moved to their own
sourced files, which greatly reduces the amount of code sourced with
common.
monkeysphere now updates authorized_keys and known_hosts in temporary
files that are then atomically moved into place upon completion.
Finally, removed the confusing return codes in the key/file processing
functions that were based on number of valid/invalid keys processed.
It was confusing in the presence of actual errors that stopped
processing.
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