Disabling SDL gui mode
OEL available net device
Making graphics and hardware virtualisation optional and configurable
Merge branch 'oracle'
adding allowed values for accelerator
Keeping the -machine type=pc if accelerator method set to "none"
Merge branch 'master' of github.com:matthbak/packer into matthbak-master

Conflicts:
	builder/qemu/step_run.go
Merge branch 'matthbak-master'
Update CHANGELOG