[VirtualBox/el7] (7 commits) ...disable webservice in i686 builders complains about memory

Summary of changes: 1b96759... Update VBox to 5.1.30 (*) 472d0ce... Some updates on VirtualBox-guest-addition based on VirtualB (*) d1f23de... fix typo in update script (*) e6c2bce... update automate script (*) 5893d3c... Restore kmk configurations VBOX_PATH_APP_PRIVATE and VBOX_P (*) 5dca50b... Merge branch 'master' into f27 (*) ad08a5c... disable webservice in i686 builders complains about memory (*) (*) This commit already existed in another branch; no separate mail sent