Merge branch 'kvm-lapic-fix-and-cleanup' into HEAD

The first half or so patches fix semi-urgent, real-world relevant APICv
and AVIC bugs.

The second half fixes a variety of AVIC and optimized APIC map bugs
where KVM doesn't play nice with various edge cases that are
architecturally legal(ish), but are unlikely to occur in most real world
scenarios

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>