[set|get]Config2 is used by master election capable dsms.
It embeds [get|set]OperationModes values.
setConfig method is obsolete, preserved only to be able to disable
temperature controller on old dsms.
[set|get]State, EventHeatingControllerState are not applicable
with master election.
masterAlive message broadcasted by current master is esential
building sone for to master election algorithm.
It also exposes internal state.
getInternals is obsolete, values in it are periodically
broadcasted in masterAlive.
Replaces !83 (closed)
Related vdsm MR: virtual-devices/vdsm!130 (closed)
#16383