cpu plugin: latency not supported per cpu, apply only on first device
audio plugin: new implementation, options are more general

Device specific options 'snd_hda_intel' and 'snd_ac97_codec'
were removed, now there are new 'timeout' and 'reset_controller'
options only. Tunings are available at the level of modules,
not devices, therefore the module names are taken as device
names in case of this plugin.
plugin commands: add numeric priority to enforce execution order
audio plugin: execute reset_controller as a last