Helm chart doesn't configure credentials in the artemis broker

Currently the Openslice chart in kubernetes/helm/openslice allows configuring the credentials to the artemis broker through the oscreds.activemq value. These values are correctly applied to the services, however they aren't set in the artemis Deployment (Link of the deployment file). This causes services to be unable to connect to the broker if the default values of the chart are changed (as they are also the default values for the artemis broker if no configuration is passed).

To solve this the ARTEMIS_USER and ARTEMIS_PASSWORD must be set in the broker deployment.