Fix rabbit prometheus scrape config on master (ITISFoundation#1049)

Related issue(s):
* ITISFoundation#1048

Author: YuryHrytsuk

services/monitoring/prometheus/prometheus-simcore.yml

@@ -92,7 +92,7 @@ scrape_configs:
       - names:
           - "tasks.production_rabbit"
           - "tasks.staging_rabbit"
-          - "task.master_rabbit"
+          - "tasks.master_rabbit"
         type: "A"
         port: 15692
       - names: