- Add support for having both a shared and exclusive queue of threads in

  each turnstile.  Also, allow for the owner thread pointer of a turnstile
  to be NULL.  This is needed for the upcoming reader/writer lock
  implementation.
- Add a new ddb command 'show turnstile' that will look up the turnstile
  associated with the given lock argument and display useful information
  like the list of threads blocked on each queue, etc.  If there isn't an
  active turnstile for a lock at the specified address, then the function
  will see if there is an active turnstile at the specified address and
  display info about it if so.
- Adjust the mutex code to handle the turnstile API changes.

Tested on:	i386 (all), alpha, amd64, sparc64 (1 and 3)

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