[BUG] do not try to pause backends during reload

During a configuration reload, haproxy tried to pause all proxies.
Unfortunately, it also tried to pause backends, which would fail
and cause trouble to the new process since the port was still bound.

(backported from commit eab5c70f93c0a44223f706f6c120ad8d59f28796)
(cherry picked from commit ac1ca38e9b07422e21b5b4778918d243768e5498)
1 file changed