BUG/MEDIUM: h1: Enforce the authority validation during H1 request parsing

BUG/MEDIUM: h1: Enforce the authority validation during H1 request parsing

When a H1 request was parsed, only a light validation was performed on the
URI, mainly because there was no distinction between the different parts of
the URI. So only characters in the range [0x21, 0x7e], excluding the "#" was
allowed.

To be consistant with the H2 and H3 parser, the authority is now validated,
using http_authority_has_forbidden_char() function.

This patch should be backported as far as 2.8. For previous verions,
http_authority_has_forbidden_char() function does not exist.