VMX controls test framework

Ultimately, this test will be expanded to cover all of the "Checks on
VMX Controls" described in the Intel SDM, volume 3, section
26.2.1. For now, it just checks I/O bitmap and MSR bitmap settings.

Signed-off-by: Jim Mattson <jmattson@google.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>