CLEANUP: connections: rename the toremove_lock to takeover_lock

This lock was misnamed and a bit confusing. It's only used for takeover
so let's call it takeover_lock.
diff --git a/src/mux_h1.c b/src/mux_h1.c
index ace04cb..a294c65 100644
--- a/src/mux_h1.c
+++ b/src/mux_h1.c
@@ -2219,13 +2219,13 @@
 	int ret = 0;
 
 
-	HA_SPIN_LOCK(OTHER_LOCK, &idle_conns[tid].toremove_lock);
+	HA_SPIN_LOCK(OTHER_LOCK, &idle_conns[tid].takeover_lock);
 	if (tl->context == NULL) {
 		/* The connection has been taken over by another thread,
 		 * we're no longer responsible for it, so just free the
 		 * tasklet, and do nothing.
 		 */
-		HA_SPIN_UNLOCK(OTHER_LOCK, &idle_conns[tid].toremove_lock);
+		HA_SPIN_UNLOCK(OTHER_LOCK, &idle_conns[tid].takeover_lock);
 		tasklet_free(tl);
 		return NULL;
 	}
@@ -2241,7 +2241,7 @@
 	if (conn_in_list)
 		MT_LIST_DEL(&conn->list);
 
-	HA_SPIN_UNLOCK(OTHER_LOCK, &idle_conns[tid].toremove_lock);
+	HA_SPIN_UNLOCK(OTHER_LOCK, &idle_conns[tid].takeover_lock);
 
 	if (!(h1c->wait_event.events & SUB_RETRY_SEND))
 		ret = h1_send(h1c);
@@ -2309,7 +2309,7 @@
 		/* We're about to destroy the connection, so make sure nobody attempts
 		 * to steal it from us.
 		 */
-		HA_SPIN_LOCK(OTHER_LOCK, &idle_conns[tid].toremove_lock);
+		HA_SPIN_LOCK(OTHER_LOCK, &idle_conns[tid].takeover_lock);
 
 		if (h1c->conn->flags & CO_FL_LIST_MASK)
 			MT_LIST_DEL(&h1c->conn->list);
@@ -2320,7 +2320,7 @@
 		if (!t->context)
 			h1c = NULL;
 
-		HA_SPIN_UNLOCK(OTHER_LOCK, &idle_conns[tid].toremove_lock);
+		HA_SPIN_UNLOCK(OTHER_LOCK, &idle_conns[tid].takeover_lock);
 	}
 
 	task_destroy(t);