BUG/MEDIUM: dns: Don't yield in do-resolve action on a final evaluation

BUG/MEDIUM: dns: Don't yield in do-resolve action on a final evaluation

When an action is evaluated, flags are passed to know if it is the first call
(ACT_OPT_FIRST) and if it must be the last one (ACT_OPT_FINAL). For the
do-resolve DNS action, the ACT_OPT_FINAL flag must be handled because the
action may yield. It must never yield when this flag is set. Otherwise, it may
lead to a wakeup loop of the stream because the inspected-delay of a tcp-request
content ruleset was reached without stopping the rules evaluation.

This patch is related to the issue #222. It must be backported as far as 2.0.

(cherry picked from commit 385101e53816dc1b7bc1fc957adc512ce8a07cb4)
Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>
(cherry picked from commit 5c038f759959adf95b4b347aba9d97e60ab87e93)
Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>