[CP] sql_nio memory_pool allocate memory form tenant after get tenant_id

deps/oblib/src/rpc/obmysql/ob_sql_sock_session.h

@@ -30,6 +30,7 @@ public:
   ObSqlSessionMemPool(): pool_() {}
   virtual ~ObSqlSessionMemPool() {}
   void* alloc(int64_t sz) { return pool_.alloc(sz); }
+  void set_tenant_id(int64_t tenant_id) { pool_.set_tenant_id(tenant_id); }
   void reset() { pool_.destroy(); }
   void reuse() { pool_.reuse(); }
 private:

deps/oblib/src/rpc/obrpc/ob_rpc_mem_pool.h

@@ -28,6 +28,7 @@ public:
   ~ObRpcMemPool() { destroy(); }
   static ObRpcMemPool* create(int64_t tenant_id, const char* label, int64_t req_sz);
   void* alloc(int64_t sz);
+  void set_tenant_id(int64_t tenant_id) { tenant_id_ = tenant_id; }
   void reuse();
   void destroy();
 private: