NOPs should not be requeued when reconnecting a session.

Just like DATA_OUT we should just discard NOPs instead of requeueing them
on session reconnect.
Add new flag that to indicate this behaviour on reconnect and set it for
both data out and nops

include/iscsi-private.h

@@ -195,7 +195,12 @@ struct iscsi_pdu {
 /* There will not be a response to this pdu, so delete it once it is sent on the wire. Dont put it on the wait-queue */
 #define ISCSI_PDU_DELETE_WHEN_SENT	0x00000001
 /* Dont call the CANCEL callback when the context is destroyed */
-#define ISCSI_PDU_NO_CALLBACK	 	0x00000002
+#define ISCSI_PDU_NO_CALLBACK		0x00000002
+/* When reconnecting, just drop all these PDUs. Dont re-queue them.
+ * This includes any DATA-OUT PDU as well as all NOPs.
+ */
+#define ISCSI_PDU_DROP_ON_RECONNECT	0x00000004
+
 	uint32_t flags;
 
 	uint32_t lun;