Configuration changes not persisted to file when cluster:config-propset is executed in a cluster of nodes

Let's suppose a cluster with two nodes: a producer and a consumer, both in default group.

From producer node cluster:config-propset command is executed to change a property value in org.apache.karaf.features PID.

Example:

$ cluster:config-propset default org.apache.karaf.features featuresBoot config,cellar

featuresBoot value is changed on both nodes, but is not updated on etc/org.apache.karaf.features.cfg file.

In karaf.log file a message like follows is written :

CELLAR CONFIG: retrieved event ClusterConfigurationEvent [type=0, id=org.apache.karaf.features, sourceNode=HazelcastNode [id=localhost:5701, host=localhost, port=5701], sourceGroup=org.apache.karaf.cellar.core.Group@5c13d641, destination=null, force=false, postPublish=false] while groupManager is not available yet

After debugging code I have found that groupManager attribute is not initialized in class org.apache.karaf.cellar.config.ConfigurationEventHandler

eventHandler bean definition in file config/src/main/resources/OSGI-INF/blueprint/blueprint.xml has no dependency injection for groupManager.

Comparing this definition with other branches looks like a regression, because on branch cellar-2.2.x or cellar-2.3.x this bean definition is

	    <!-- Cluster Event Handler -->
	    <bean id="eventHandler" class="org.apache.karaf.cellar.config.ConfigurationEventHandler"
	          init-method="init" destroy-method="destroy">
	        <property name="clusterManager" ref="clusterManager"/>
	        <property name="groupManager" ref="groupManager"/>
	        <property name="configurationAdmin" ref="configurationAdmin"/>
	        <property name="storage" value="${storage}"/>
	    </bean>

Injecting groupManager definition will solve the issue.