[change] dataservice use the new ConnectionPersister(SnakeYaml)
[delete] old ConnectionsReaderWriter(property)
[fix] - PollTaskTest failure

!Attention! This test needs the config.properties and connections.yml
file in the dataservice\target\classes dir. Quick solution copy this
files manually. In future will copied this with maven.
[change] - at the default connection set startupConnection = true