 - Move the logic that locks and refs the new vnode from vfs_cache_lookup()    to cache_lookup().  This allows us to acquire the vnode interlock before    dropping the cache lock.  This protects the vnodes identity until we    have locked it.
 - Move the logic that locks and refs the new vnode from vfs_cache_lookup()
   to cache_lookup().  This allows us to acquire the vnode interlock before
   dropping the cache lock.  This protects the vnodes identity until we
   have locked it.

Sponsored by:	Isilon Systems, Inc.

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