L2SS-470: Fix startup of docker and observation_control devices

CDB/LOFAR_ConfigDb.json

 {
     "servers": {
-        "docker_device": {
+        "Docker": {
             "STAT": {
                 "Docker": {
                     "STAT/Docker/1": {}
@@ -14,7 +14,7 @@
                 }
             }
         },
-        "observation_control": {
+        "ObservationControl": {
             "STAT": {
                 "ObservationControl": {
                     "STAT/ObservationControl/1": {}