Client library: kfs protocol state machine: fix detaching shared buffers condition with in flight operation cancellation by removing now incorrect predicate that the op must have been submitted with buffers, potentially resulting in write after free causing malloc structure "corruption", due to use the buffers by receiving and discarding the reply logic after op has been canceled. It is also quite possible that the extraneous predicate was redundant and harmful for quite a while, but has never caused problems as no [meta] RPCs replies in this code path had non zero "content [length]".
Client library: fix lease renew unwind with potentially "synchronous"/immediate completion by comparing in flight meta op pointer with lease renew immediately after lease renew submit method return.
Qfs tool: move set skip holes after setting sparse file support as skip holes presently turns on full sparse file support.