cleanup temp folders
expose omnibus options to container
document Docker options
only install package on AMIs
cleanup apt update
create ova directly
Revert "create ova directly"

This reverts commit 269a959573dcf10078f426812330d355056a7878.
add OVA convert script
add Gemfile
show usage when no filename is given
add short ova docu
bump gl2 version
add 0.92.3 amis