Change the way vnode_setup handles plab nodes a bit to avoid a couple of
buggy situations. * Don't try vnodesetup -h on plab nodes This can hang, or even fail. Since nothing useful is conveyed by this step, just skip it, set the node's state to SHUTDOWN, and ask pl_conf on the node to remove the vserver. * Set plab node's alloc state to TBDB_ALLOCSTATE_RES_INIT_DIRTY after instantiation. This avoids a bug where Emulab cluster nodes fail to come up, and so os_setup never waits on the plab vnodes (now that they are started in parallel with physical node setup). Previously their alloc state made them look clean, and so the vservers would not be reaped during teardown.
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