chore(ansible): clean up host_vars YAML and normalize mail text blocks

host_vars/o13.oopen.de/o13-common.yml

@@ -1,14 +1,15 @@
 ---
+# yamllint disable rule:line-length
 
 # ---
 # vars used by roles/network_interfaces
 # ---
 
 # If true, all additional files in /etc/network/interfaces/interfaces.d/ are deleted
-network_manage_devices: True
+network_manage_devices: true
 
 # Should the interfaces be reloaded after config change?
-network_interface_reload: False
+network_interface_reload: false
 
 network_interface_path: /etc/network/interfaces.d
 network_interface_required_packages:
@@ -20,7 +21,7 @@ network_interface_required_packages:
 
 
 network_interfaces:
-  
+
 # ---
 # vars used by roles/ansible_dependencies
 # ---
@@ -104,7 +105,7 @@ resolved_nameserver:
 # If there are more than one search domains, then specify them here in the order in which
 # the resolver should also search them
 #
-#resolved_domains: []
+# resolved_domains: []
 resolved_domains:
   - ~.
   - oopen.de
@@ -114,7 +115,7 @@ resolved_dnssec: false
 # dns.as250.net: 194.150.168.168
 #
 resolved_fallback_nameserver:
-   - 194.150.168.168
+  - 194.150.168.168
 
 
 # ---