Merge branch 'master' into redundancy

Conflicts:
	code/CCLabCore/src/main/java/com/cclab/core/scheduler/Node.java
	code/CCLabCore/src/main/java/com/cclab/core/utils/BootObserver.java
	code/CCLabCore/src/main/java/com/cclab/core/utils/NodeLogger.java
	code/CCLabCore/src/main/resources/log4j.properties
	helper.sh