[VirtualBox/f27] (4 commits) ...fix typo in update script

Summary of changes: 6225cb4... Epel 7 with X 1.19 don't need vboxvideo_drv https://forum (*) 1b96759... Update VBox to 5.1.30 (*) 472d0ce... Some updates on VirtualBox-guest-addition based on VirtualB (*) d1f23de... fix typo in update script (*) (*) This commit already existed in another branch; no separate mail sent