performance model: add new classes to simulate CPU, NIC, HBA
	eliminates a lot of magic constants in other simulations
performance model: rebase server simulation on NIC/CPU classes
	eliminating magic numbers for NIC and CPU costs
performance model: refactor FS simulations into common and arch/dep
	architecture dependent modules qualify as LGPL applications
performance models: refactor reporting code
	create one common report generation class
	change existing test cases to use it
performance model: exploit new CPU, NIC and zfs classes