Fetch nvme_revoke_tls_key.

Signed-off-by: Daniel Wagner <dwagner@suse.de>

The export command should use stdout as default output as documentation
claims. Furthermore, it should open the keyfile to write in write mode.

Signed-off-by: Daniel Wagner <dwagner@suse.de>

When exporting a TLS keys from the kernel keyring a line might have a
newline. Strip the newline away as the nvme_import_tls_key is not
expecting it and thus fails to load an exported keyfile.

Signed-off-by: Daniel Wagner <dwagner@suse.de>

The tls_key function is using a STREAM object and closes it when leaving
the context. Update it to use the helper.

Signed-off-by: Daniel Wagner <dwagner@suse.de>

discover_from_conf_file uses a STREAM. Let's use the cleanup helper to
close it.

Signed-off-by: Daniel Wagner <dwagner@suse.de>

write_file uses a STREAM. Let's use the cleanup helper to close it.

Signed-off-by: Daniel Wagner <dwagner@suse.de>

io_mgmt_send uses a file descriptor. Let's use the cleanup helper to
close it.

Signed-off-by: Daniel Wagner <dwagner@suse.de>

Split the command line option handling code from the operation.

Signed-off-by: Daniel Wagner <dwagner@suse.de>

Propagate error codes for TLS commands. Also print an error message when
scanning TLS keys.

Signed-off-by: Daniel Wagner <dwagner@suse.de>

Add support to nvme-cli to revoke TLS keys from a keyring.

Signed-off-by: Daniel Wagner <dwagner@suse.de>

Sort the file names alphabetically.

Signed-off-by: Daniel Wagner <dwagner@suse.de>

The shorthand for --keyfile is -f and not -k.

Signed-off-by: Daniel Wagner <dwagner@suse.de>

Add the --revoke option to the tls-key documentation.

While at it, add examples how to use it.

Signed-off-by: Daniel Wagner <dwagner@suse.de>

The tls-key command is missing support for the zsh and bash completion.

Signed-off-by: Daniel Wagner <dwagner@suse.de>