Change in vdsm[master]: open: Change file() to open()

Antoni Segura Puimedon has posted comments on this change.

Change subject: open: Change file() to open()
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Patch Set 1: Code-Review+1

Thanks for this. It was long overdue that we'd get rid of the 'file' calling. The only downside is that expanding 'f' to 'file' shadows the file callable (which is considered a bad practice), though since it is shadowing something for which there is little legitimate use, I'm ok with it.