MINOR: http: add new function http_path_has_forbidden_char()

MINOR: http: add new function http_path_has_forbidden_char()

Origin: https://git.haproxy.org/?p=haproxy-2.2.git;a=commit;h=921f79588c6180c406e88236228a5be1c5c67c55

As its name implies, this function checks if a path component has any
forbidden headers starting at the designated location. The goal is to
seek from the result of a successful ist_find_range() for more precise
chars. Here we're focusing on 0x00-0x1F, 0x20 and 0x23 to make sure
we're not too strict at this point.

(cherry picked from commit 30f58f4217d585efeac3d85cb1b695ba53b7760b)
 [ad: backported for following fix : BUG/MINOR: h2: reject more chars
  from the :path pseudo header]
Signed-off-by: Amaury Denoyelle <adenoyelle@haproxy.com>
(cherry picked from commit b491940181a88bb6c69ab2afc24b93a50adfa67c)
Signed-off-by: Amaury Denoyelle <adenoyelle@haproxy.com>
(cherry picked from commit f7666e5e43ce63e804ebffdf224d92cfd3367282)
Signed-off-by: Amaury Denoyelle <adenoyelle@haproxy.com>
(cherry picked from commit c699bb17b7e334c9d56e829422e29e5a204615ec)
[wt: adj minor ctx in http.h]
Signed-off-by: Willy Tarreau <w@1wt.eu>
(cherry picked from commit 0f57ac20b046b70275192651d7b6c978032e6a36)
[wt: adj minor ctx in http.h]
Signed-off-by: Willy Tarreau <w@1wt.eu>
Gbp-Pq: Name MINOR-http-add-new-function-http_path_has_forbidden_.patch