CLEANUP: pools: rename __pool_free() to pool_put_to_shared_cache()

Now the multi-level cache becomes more visible:

    pool_get_from_local_cache()
    pool_put_to_local_cache()
    pool_get_from_shared_cache()
    pool_put_to_shared_cache()
diff --git a/include/haproxy/pool.h b/include/haproxy/pool.h
index c8e5ca5..6f01971 100644
--- a/include/haproxy/pool.h
+++ b/include/haproxy/pool.h
@@ -136,7 +136,7 @@
 	return NULL;
 }
 
-static inline void __pool_free(struct pool_head *pool, void *ptr)
+static inline void pool_put_to_shared_cache(struct pool_head *pool, void *ptr)
 {
 	_HA_ATOMIC_DEC(&pool->used);
 	_HA_ATOMIC_DEC(&pool->allocated);
@@ -182,7 +182,7 @@
  * Both the pool and the pointer must be valid. Use pool_free() for normal
  * operations.
  */
-static inline void __pool_free(struct pool_head *pool, void *ptr)
+static inline void pool_put_to_shared_cache(struct pool_head *pool, void *ptr)
 {
 	void **free_list = pool->free_list;
 
@@ -234,7 +234,7 @@
 /* unconditionally stores the object as-is into the global pool. The object
  * must not be NULL. Use pool_free() instead.
  */
-static inline void __pool_free(struct pool_head *pool, void *ptr)
+static inline void pool_put_to_shared_cache(struct pool_head *pool, void *ptr)
 {
 #ifndef DEBUG_UAF /* normal pool behaviour */
 	HA_SPIN_LOCK(POOL_LOCK, &pool->lock);
@@ -342,7 +342,7 @@
 			return;
 		}
 #endif
-		__pool_free(pool, ptr);
+		pool_put_to_shared_cache(pool, ptr);
 	}
 }
 
diff --git a/src/pool.c b/src/pool.c
index d1e48fd..db5d931 100644
--- a/src/pool.c
+++ b/src/pool.c
@@ -141,7 +141,7 @@
 		ph->count--;
 		pool_cache_count--;
 		pool_cache_bytes -= pool->size;
-		__pool_free(pool, item);
+		pool_put_to_shared_cache(pool, item);
 	} while (pool_cache_bytes > CONFIG_HAP_POOL_CACHE_SIZE * 7 / 8);
 }
 #endif