x86: VMX: Verify blocked vCPU in guest-mode wake when pending interrupt in RVI

This test aims to verify that when entering a guest in HLT activity
state but with a pending interrupt in RVI, the guest is in fact not
halted and an interrupt is indeed injected.

For more information, see commit message of kernel patch "KVM: nVMX:
Wake blocked vCPU in guest-mode if pending interrupt in virtual
APICv".

Reviewed-by: Nikita Leshenko <nikita.leshchenko@oracle.com>
Reviewed-by: Darren Kenny <darren.kenny@oracle.com>
Signed-off-by: Liran Alon <liran.alon@oracle.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>