MINOR: config: disable busy polling on old processes

in the context of seamless reload and busy polling, older processes will
create unecessary cpu conflicts; we can assume there is no need for busy
polling for old processes which are waiting to be terminated.

This patch is not a bug fix itself but might be a good stability
improvment when you are un the context of frequent seamless reloads with
a high "hard-stop-after" value; for that reasons I think this patch
should be backported in all 2.x versions.

Signed-off-by: William Dauchy <w.dauchy@criteo.com>
(cherry picked from commit 3894d97fb8b66e247c5a326c6b3aa75816c597dc)
Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>
(cherry picked from commit 493c8d8d3c2f710d47b2bdd6a8ea582a84c1cf72)
Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>
2 files changed