BUG/MINOR: tcpcheck: Fix numbering of implicit HTTP send/expect rules

BUG/MINOR: tcpcheck: Fix numbering of implicit HTTP send/expect rules

The index of the failing rule is reported in the health-check log message. The
rules index is also used in the check traces. But for implicit HTTP send/expect
rules, the index is wrong. It must be incremented by one compared to the
preceding rule.

This patch may be backported as far as 2.2.

(cherry picked from commit fa5880bd539b9069fd1b139d32cffae2bb3c2c3c)
Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>
(cherry picked from commit b3cb3221e5dabc73deec942a3475ef21289853bd)
Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>