performance simulation: cleanups shared with ceph-tools
	mirror cleanups committed to ceph-tools wip-model-perf
perf model: renames and deletions of unneeded modules
perf model: first cut at new server model
	this is a whole server (all disks) simulation
	produces plausible results
	new simulation return (latency,bw) vector
	contains numerous FIX warnings for missing/wrong things