Put back the old non-parallelized nova boot path; option for future.
I won't get the Neutron lock bug solved in time for this eval churn, so for now, undo the path where we launch all the slaves via a single 'nova boot' call. This caused lockups in Neutron after N slaves had been created; cause unknown. Doing a call per VM probably isn't much slower in the long run, anyway.
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