fix flat allocator tests to work with new connection buffer group scheme

Summary: n/a

Reviewed By: ps

Test Plan: passed flat allocator tests.

Revert: OK

test/flat_storage_tests/memcached.h

@@ -114,10 +114,13 @@ extern const char indent_str[257];
 
 
 #include "items.h"
+#include "conn_buffer.h"
 
 
 typedef struct conn_s conn;
 struct conn_s {
+    conn_buffer_group_t* cbg;
+
     bool binary;
 
     struct iovec* riov;        /* read iov */
@@ -229,9 +232,6 @@ extern bool lru_check(void);
 extern bool item_chunk_check(const item* it);
 extern int verify_key(const item* it, const char* key);
 
-#define alloc_conn_buffer do_alloc_conn_buffer
-#define conn_buffer_reclamation do_conn_buffer_reclamation
-
 #define STATS_LOCK() ;
 #define STATS_UNLOCK() ;