Merge remote-tracking branch 'origin/28-automatic-detection-of-cluste…

…r-node-type-and-availability-of-nodes-described-in-the-configuration' into 28-automatic-detection-of-cluster-node-type-and-availability-of-nodes-described-in-the-configuration

# Conflicts:
#	pkg/activerecord/activerecord.go
#	pkg/activerecord/cluster.go
#	pkg/activerecord/pinger.go
#	pkg/activerecord/pinger_test.go