x86: Reboot, if ACPI shutdown did not work

Recent qemu-system-x86 do not shutdown properly.
As a workaround, the system is resetted after a failed shutdown.
Use -no-reboot in qemu to exit qemu properly.

Change-Id: Id130f999223b334be8a7fd2f69d718c7a642872b
OIL Support: Adding .oil file support

Change-Id: Ibc1cdf06312910f69254b8af25e8862d0fce79e7
Readme: Corrections.

Change-Id: I7cf1bb5c0d04af245825c7ffe8efbb484c880cf0