Make the interactions in allocating buffers less confusing.

- getnewbuf dies. instead of having getnewbuf, buf_get, buf_stub and
 buf_init we now have buf_get that is smaller than some of those
 functions were before.

- Instead of allocating anonymous buffers and then freeing them if we
 happened to lose the race to the hash, always allocate a buffer knowing
 which <vnode, block> it will belong to.

- In cluster read, instead of allocating an anonymous buffer to cover
 the whole read and then stubs for every buffer under it, make the
 first buffer in the cluster cover the whole range and then shrink it
 in the callback.

now, all buffers are always on the correct hash and we always know their
identity.

discussed with many, kettenis@ ok

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