Use better name for result parameter with blob information
Use better name for result parameter with blob information

This remove problem with using differently scoped variables in source
code: one for globally (per-module) declared `blobAccess` variable,
the second used as name for result information parameter of
`createBlockBlobFromText` method callback

Thanks!

Azure/azure-storage-node,XiaoningLiu/azure-storage-node,XiaoningLiu/azure-storage-node,Azure/azure-storage-node