kvm: fix the check of use_nat parameter

software/kvm/common.cfg

@@ -106,7 +106,7 @@ on-update = true
 recipe = hexagonit.recipe.download
 url = ${:_profile_base_location_}/instance-kvm-cluster.cfg.jinja2.in
 mode = 644
-md5sum = 6ac9d1b06398b57cc1c8d63a9c492415
+md5sum = 3fc6611feaabcacd7e51f3b5681120fd
 download-only = true
 on-update = true
 

software/kvm/instance-kvm-cluster.cfg.jinja2.in

@@ -74,7 +74,7 @@ config-document-path = ${hash-code:passwd}
 return = 
   backend-url
   url
-{% if str(use_nat).lower() -%}
+{% if str(use_nat).lower() == 'true' -%}
 {%   for port in nat_rules_list -%}
 {{ '  ' }}nat-rule-url-{{ port }}
 {%   endfor -%}