kvm-unit-tests: nSVM: Test that MBZ bits in CR3 and CR4 are not set on vmrun of nested guests

According to section "Canonicalization and Consistency Checks" in APM vol. 2,
the following guest state is illegal:

	"Any MBZ bit of CR3 is set."
	"Any MBZ bit of CR4 is set."

Signed-off-by: Krish Sadhukhan <krish.sadhukhan@oracle.com>
Message-Id: <1594168797-29444-4-git-send-email-krish.sadhukhan@oracle.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>