We have IGNITE_DAEMON JVM property that just duplicates grid configuration property.
Usually, system options are used to override config defaults or as temporary solution to turn on\off some Ignite modes that can't be done via config.
Seems, this option usage is error prone as
- it is not really override an config option
- we ignore this option in most cases when we check config.isDaemon().
- it causes performance issue
Also, I see no case when this option can be useful.
Let's drop IGNITE_DAEMON option and revert a