Fix boolean assignments in templates

By the rules [1] booleans should be represented by the unquoted symbols true and
false. This commit ensures the non quotation and the lowercase for every
assignment.

[1] https://developer.hashicorp.com/terraform/language/expressions/types#bool

templates/libvirt/networks.tf.j2

@@ -7,20 +7,20 @@
 resource "libvirt_network" "{{ network.name }}" {
     name      = "{{ network.name }}"
     mode      = "{{ network.mode }}"
-    autostart = "{{ network.autostart | default('true') }}"
+    autostart = {{ network.autostart | default('true') | lower() }}
 {% if network.domain is defined %}
     domain    = "{{ network.domain }}"
 {% endif %}
     addresses = [{% for address in network.addresses %}"{{ address }}"{%- if not loop.last -%}, {%- endif -%}{% endfor %}]
 
     dhcp {
-      enabled = {{ network.dhcp_enabled | default('true') }}
+      enabled = {{ network.dhcp_enabled | default('true') | lower() }}
     }
 
 {% if network.dns_enabled is defined and network.dns_enabled | bool %}
     dns {
       enabled = {{ network.dns_enabled }}
-     local_only = {{ network.dns_local_only | default('false') }}
+     local_only = {{ network.dns_local_only | default('false') | lower() }}
 
 {% for forwarder in libvirt_network.dns_forwarders %}
       forwarders {

templates/libvirt/vms.tf.j2

@@ -25,7 +25,7 @@ resource "libvirt_volume" "{{ disk.volume_id }}" {
 # VM {{ vm.name }} specification
 resource "libvirt_domain" "{{ vm.name }}" {
   name                         = "{{ vm.name }}"
-  running                      = "{{ vm.running | default('true') | lower() }}"
+  running                      = {{ vm.running | default('true') | lower() }}
   memory                       = "{{ vm.memory }}"
   vcpu                         = "{{ vm.vcpu }}"