rabbitmq: Remove consumer timeout to give long workers the time to do their job

Some origins can take several days to be ingested (svn, ...) so the default
30mn timeout is way to small.

Related to swh/infra/sysadm-environment#5595

site-modules/profile/manifests/rabbitmq.pp

@@ -14,6 +14,7 @@ class profile::rabbitmq {
     interface        => '0.0.0.0',
     config_variables => {
       vm_memory_high_watermark => 0.6,
+      consumer_timeout => "undefined",
     },
     heartbeat        => 0,
     manage_python    => false,