L2SS-205: Change base compose files minimally

docker-compose/elk.yml

@@ -6,6 +6,7 @@
 #   - elk-configure-host: Configures the hosts's kernel to be able to use the ELK stack
 #   - elk: ELK stack
 #
+
 version: '2'
 
 volumes:

docker-compose/grafana.yml

@@ -4,6 +4,7 @@
 # Defines:
 #   - grafana: Grafana
 #
+
 version: '2'
 
 #volumes:

docker-compose/jupyter.yml

@@ -7,6 +7,7 @@
 # Defines:
 #   - jupyter: Jupyter Notebook with iTango support
 #
+
 version: '2'
 
 services:

docker-compose/lofar-device-base.yml

@@ -10,6 +10,7 @@
 # Requires:
 #   - tango.yml
 #
+
 version: '2'
 
 services:

docker-compose/prometheus.yml

@@ -4,6 +4,7 @@
 # Defines:
 #   - prometheus: Prometheus
 #
+
 version: '2'
 
 services: