BUG/MINOR: http-ana: Only consider dst address to process originalto option

BUG/MINOR: http-ana: Only consider dst address to process originalto option

When an except parameter is used for originalto option, only the destination
address must be evaluated. Especially, the address family of the destination
must be tested and not the source one.

This patch must be backported to all stable versions. However be careful,
depending the versions the code may be slightly different.

(cherry picked from commit cccded98c7b3f2281fe4481895b1392e78cc5df0)
Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>