Fix RADIUS error reporting in hba file parsing

Fix RADIUS error reporting in hba file parsing

The RADIUS-related checks in parse_hba_line() did not respect elevel
and did not fill in *err_msg.  Also, verify_option_list_length()
pasted together error messages in an untranslatable way.  To fix the
latter, remove the function and do the error checking inline.  It's a
bit more verbose but only minimally longer, and it makes fixing the
first two issues straightforward.

Reviewed-by: Magnus Hagander <magnus@hagander.net>
Discussion: https://www.postgresql.org/message-id/flat/8381e425-8c23-99b3-15ec-3115001db1b2%40enterprisedb.com