libxl: check whether vcpu affinity and vnuma info match

libxl: check whether vcpu affinity and vnuma info match

More specifically, vcpus are assigned to a vnode, which in
turn is associated with a pnode. If a vcpu also has, in its
(hard or soft) affinity, some pcpus that are not part of the
said pnode, print a warning to the user.

Signed-off-by: Dario Faggioli <dario.faggioli@citrix.com>
Cc: Ian Campbell <ian.campbell@citrix.com>
Cc: Ian Jackson <Ian.Jackson@eu.citrix.com>
Cc: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Cc: Wei Liu <wei.liu2@citrix.com>
Acked-by: Wei Liu <wei.liu2@citrix.com>