kernel - Fix more wiring / fictitious bugs w/recent VM work

kernel - Fix more wiring / fictitious bugs w/recent VM work

* Fictitious pages cannot be placed on any VM paging queue,
  assert this and fix a few places where it could.

* This will remove most of the 'Encountered wired page %p on queue'
  warnings reported.  This kprintf() is still in place for the moment
  because generally speaking pages should be unwired before VM objects
  are destroyed.

  But other than VM object destruction, its actually ok for wired pages
  to be on the paging queues now.