REGTEST: script: Add the option --use-htx to enable the HTX in regtests

A check is done on HAProxy version to be sure it is supported. Internally, by
default, the macro 'no-htx' is set to "#". So in regtests, we can prefix
http-use-htx option line with this macro to inhibit the HTX. Concretly, this
line can be added in the HAProxy configuration:

   ${no-htx} option http-use-htx

When the option --use-htx is used, the macro 'no-htx' is unset.
1 file changed