[libvirt] [PREPOST 15/17] src/xenxs:Refactor Vif formating code

[Jim Fehlig]

David kiarie wrote:
> Thanks for the review, am applying changes to address your comments.
>   

Thanks David, looking forward to a V2.

BTW, 16/17 and 17/17 look good with exception of the usual whitespace
comments.

Regards,
Jim