BUG/MEDIUM: cli: Deadlock when setting frontend maxconn

BUG/MEDIUM: cli: Deadlock when setting frontend maxconn

The proxy lock state isn't passed down to relax_listener
through dequeue_proxy_listeners, which causes a deadlock
in relax_listener when it tries to get that lock.

Backporting: Older versions didn't have relax_listener and directly called
resume_listener in dequeue_proxy_listeners. lpx should just be passed directly
to resume_listener then.

The bug was introduced in commit 001328873c352e5e4b1df0dcc8facaf2fc1408aa

[cf: This patch should fix the issue #2726. It must be backported as far as
2.4]