Fixed #831: changed several cases where a shared readerIndex was changed #832
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DebugUtils.payload2Str set the readerIndex to the readableBytes, witch was simply wrong.
Utils.readBytesAndRewind was unused and thus removed. Though it changed the readerIndex, it also reset it, but this use would still have not been thread-safe.
SegmentedPersistentQueueSerDes use of readBytes (that changes the readerIndex) was changed to getBytes which does not change the readerIndex.
Closes #831