BUG/MINOR: cli: dequeue from the proxy when changing a maxconn

The "set maxconn frontend" statement on the CLI tries to dequeue possibly
pending requests, but due to a copy-paste error, they're dequeued on the
CLI's frontend instead of the one being changed.

The impact is very minor as it only means that possibly pending connections
will still have to wait for a previous one to complete before being accepted
when a limit is raised.

This fix has to be backported to 1.6 and 1.5.
(cherry picked from commit 74a5a9828b7eba80248573e110bc8ed388d8b692)
(cherry picked from commit 47ef00f08c107ab479df75f11b79a5da1cfcbaa4)
1 file changed