This flag is used when we dont want the CANCEL callback to be invoked if the
context is destroyed.
Thsi will be used for the sequence where we send multiple PDUs
to the target for one single scsi task, such as
-> WRITE10 cdb
-> DATAOUT
-< RESPONSE
Since if the context is destroyed when the command is in flight, we
already get the CANCEL callback for the WRITE10 PDU, so we dont need to invoke
it again for when we destroy the DATAOUT pdu, since they both refer to the same
task.
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