Werk #13347: check_sftp: Fix command line argument for private key

The active check check_sftp claimed to accept --private-key as a command line argument for specifying a private key to be used for the SFTP login. However, attempting to use this option resulted in the error option --private-key not recognized.

As of this werk, check_sftp accepts --private-key-file as a command line argument. This can be used to specify the path to a private key or certificate file which will be used for authentication.

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