http: better error message for HTTP/1.x response without status line

If a response without a status line is received, and the connection is
known to use HTTP/1.x (not HTTP/0.9), report t

http: better error message for HTTP/1.x response without status line

If a response without a status line is received, and the connection is
known to use HTTP/1.x (not HTTP/0.9), report the error "Invalid status
line" instead of "Received HTTP/0.9 when not allowed".

Closes #13045

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