netrc: address several netrc parser flaws

- make sure that a match that returns a username also returns a
password, that should be blank if no password is found

- fix handling

netrc: address several netrc parser flaws

- make sure that a match that returns a username also returns a
password, that should be blank if no password is found

- fix handling of multiple logins for same host where the password/login
order might be reversed.

- reject credentials provided in the .netrc if they contain ASCII control
codes - if the used protocol does not support such (like HTTP and WS do)

Reported-by: Harry Sintonen

Add test 478, 479 and 480 to verify. Updated unit 1304.

Closes #15586

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