util: eliminate extra args from virExec
All args except "cmd" in the call to virExec are now redundant, since they can all be found in cmd, so remove the args and reference the data directly in cmd. One exception to this is that "infd" was being modified within virExec, and modifying the original in cmd caused make check failures, so cmd->infd is copied to a local, and the local is used during virExec().
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