CLEANUP: connection: rename the wait_event.task field to .tasklet

It's really confusing to call it a task because it's a tasklet and used
in places where tasks and tasklets are used together. Let's rename it
to tasklet to remove this confusion.
diff --git a/include/proto/connection.h b/include/proto/connection.h
index 67177c5..115e7aa 100644
--- a/include/proto/connection.h
+++ b/include/proto/connection.h
@@ -716,9 +716,9 @@
 
 static inline struct wait_event *wl_set_waitcb(struct wait_event *wl, struct task *(*cb)(struct task *, void *, unsigned short), void *ctx)
 {
-	if (!wl->task->process) {
-		wl->task->process = cb;
-		wl->task->context = ctx;
+	if (!wl->tasklet->process) {
+		wl->tasklet->process = cb;
+		wl->tasklet->context = ctx;
 	}
 	return wl;
 }
diff --git a/include/proto/stream_interface.h b/include/proto/stream_interface.h
index 50373ac..63f1738 100644
--- a/include/proto/stream_interface.h
+++ b/include/proto/stream_interface.h
@@ -122,11 +122,11 @@
 	si->end            = NULL;
 	si->state          = si->prev_state = SI_ST_INI;
 	si->ops            = &si_embedded_ops;
-	si->wait_event.task = tasklet_new();
-	if (!si->wait_event.task)
+	si->wait_event.tasklet = tasklet_new();
+	if (!si->wait_event.tasklet)
 		return -1;
-	si->wait_event.task->process    = si_cs_io_cb;
-	si->wait_event.task->context = si;
+	si->wait_event.tasklet->process = si_cs_io_cb;
+	si->wait_event.tasklet->context = si;
 	si->wait_event.events = 0;
 	return 0;
 }
diff --git a/include/types/connection.h b/include/types/connection.h
index 54f8d1a..cc2fb17 100644
--- a/include/types/connection.h
+++ b/include/types/connection.h
@@ -65,7 +65,7 @@
 };
 
 struct wait_event {
-	struct tasklet *task;
+	struct tasklet *tasklet;
 	int events;             /* set of enum sub_event_type above */
 };