Rework prometheus blackbox monitoring configuration

* Use scrape_config_files correctly
 * Do not separate prometheus and blackbox exporter nodes
 * Add a http_2xx_selfsigned module for self-signed certs
 * Monitor missing services
 * Switch from CRLF to LF in prometheus.config.j2

ansible/playbooks/monitoring.yml

@@ -12,21 +12,11 @@
   become: yes
   roles:
     - prometheus
+    - blackbox-exporter
   vars:
-    blackbox: false
     scrape_files:
       - /etc/prometheus/scrape-main.yml
-
-#- name: Install and configure Prometheus node - Blackbox nodes
-#  hosts: blackbox
-#  become: yes
-#  roles:
-#    - prometheus
-#    - blackbox-exporter
-#  vars:
-#    blackbox: true
-#    scrape_files:
-#      - /etc/prometheus/scrape-blackbox.yml
+      - /etc/prometheus/scrape-blackbox.yml
 
 - name: Install and configure nodes
   hosts: all