CLEANUP: server: rename srv_cleanup_{idle,toremove}_connections()

These function names are unbearably long, they don't even fit into the
screen in "show profiling", let's trim the "_connections" to "_conns",
which happens to match the name of the lists there.
diff --git a/src/cfgparse.c b/src/cfgparse.c
index 317ef2a..247b3c4 100644
--- a/src/cfgparse.c
+++ b/src/cfgparse.c
@@ -3270,14 +3270,14 @@
 					if (!idle_conn_task)
 						goto err;
 
-					idle_conn_task->process = srv_cleanup_idle_connections;
+					idle_conn_task->process = srv_cleanup_idle_conns;
 					idle_conn_task->context = NULL;
 
 					for (i = 0; i < global.nbthread; i++) {
 						idle_conns[i].cleanup_task = task_new(1UL << i);
 						if (!idle_conns[i].cleanup_task)
 							goto err;
-						idle_conns[i].cleanup_task->process = srv_cleanup_toremove_connections;
+						idle_conns[i].cleanup_task->process = srv_cleanup_toremove_conns;
 						idle_conns[i].cleanup_task->context = NULL;
 						HA_SPIN_INIT(&idle_conns[i].idle_conns_lock);
 						MT_LIST_INIT(&idle_conns[i].toremove_conns);