MINOR: stream-int: rename si_applet_{want|stop|cant}_{get|put}

It doesn't make sense to limit this code to applets, as any stream
interface can use it. Let's rename it by simply dropping the "applet_"
part of the name. No other change was made except updating the comments.
diff --git a/src/map.c b/src/map.c
index d94b0f2..859ad89 100644
--- a/src/map.c
+++ b/src/map.c
@@ -381,7 +381,7 @@
 				 */
 				LIST_ADDQ(&elt->back_refs, &appctx->ctx.map.bref.users);
 				HA_SPIN_UNLOCK(PATREF_LOCK, &appctx->ctx.map.ref->lock);
-				si_applet_cant_put(si);
+				si_cant_put(si);
 				return 0;
 			}
 
@@ -410,7 +410,7 @@
 		chunk_reset(&trash);
 		chunk_appendf(&trash, "# id (file) description\n");
 		if (ci_putchk(si_ic(si), &trash) == -1) {
-			si_applet_cant_put(si);
+			si_cant_put(si);
 			return 0;
 		}
 
@@ -440,7 +440,7 @@
 				/* let's try again later from this stream. We add ourselves into
 				 * this stream's users so that it can remove us upon termination.
 				 */
-				si_applet_cant_put(si);
+				si_cant_put(si);
 				return 0;
 			}
 
@@ -561,7 +561,7 @@
 				 * this stream's users so that it can remove us upon termination.
 				 */
 				HA_SPIN_UNLOCK(PATREF_LOCK, &appctx->ctx.map.ref->lock);
-				si_applet_cant_put(si);
+				si_cant_put(si);
 				return 0;
 			}