fix unit tests

usually top scope variables are not referenced using their qualified
global name, but in this case it's reasonable as the local scope
variable should default to the top scope variable with the same name

manifests/init.pp

@@ -53,7 +53,7 @@
   Boolean $debug,
   Boolean $searchpath_merge,
   Array $searchpath,
-  Array $foreman_interfaces = $foreman_interfaces,
+  Array $foreman_interfaces = $::foreman_interfaces,
   Array $foreman_searchpath = [$domainname], # lint:ignore:variable_scope foreman injected top scope variable
 ) {
   include 'network'