Getting img file name from ovf instead of guessing it from ovf filename (TUI-112)
+ more robust filelist handling save_to_tar
Merge pull request #151 from opennode/tui-112

Getting img file name from ovf instead of guessing it from ovf filename ...
Fix minor formatting issues + use dict literal
Added extra log statement for VM image resizing (LEV-110)
Fixed a typo in logging statement (LEV-110)
Fixed a calculation error for kvm diskspace detection (LEV-110)
Raise log level of reporting for negative disk increase (LEV-110)