dsn: escape and unescape user field #689
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Description
Sometimes usernames may have characters that need encoding such as : or
@. This fixes the problem by url escaping the username on FormatDSN and
unescaping it on ParseDSN.
Although the DSNs are not proper URIs escaping of username is defined in
https://www.ietf.org/rfc/rfc3986.txt
Fixes: #688
Checklist