issue: 3586273 Use XLIO_DEFERRED_CLOSE by default

For incoming sockets - no change.
For outgoing sockets - since outgoing sockets occupy local port, we
should release it on socket destructor to prevent race from another
socket to use the same port.
This race might cause XLIO to hold 2 socket with the same RFS object at
the same time, and this is fatal (particularly for TCP).

Signed-off-by: Iftah Levi <iftahl@nvidia.com>

src/core/util/sys_vars.h

@@ -872,7 +872,7 @@ extern mce_sys_var &safe_mce_sys();
 #endif /* DEFINED_UTLS */
 
 #define MCE_DEFAULT_LRO                            (option_3::AUTO)
-#define MCE_DEFAULT_DEFERRED_CLOSE                 (false)
+#define MCE_DEFAULT_DEFERRED_CLOSE                 (true)
 #define MCE_DEFAULT_TCP_ABORT_ON_CLOSE             (false)
 #define MCE_DEFAULT_RX_POLL_ON_TX_TCP              (false)
 #define MCE_DEFAULT_TRIGGER_DUMMY_SEND_GETSOCKNAME (false)