Order of the class parameters is refactored

Order and intendation of those parameters are changed
to follow Puppet Style Guide recommendation [0].
Moreover, it will allow to an user to find much faster
a variable in a list of variables.

[0]. https://docs.puppetlabs.com/guides/style_guide.html

Change-Id: I5df9f22616afcc9b460334d0a74a7e54973297e9

manifests/init.pp

@@ -21,14 +21,14 @@
 # http://www.exim.org/exim-html-current/doc/html/spec_html/index.html
 
 class exim(
-  $mailman_domains = [],
-  $queue_interval = '30m',
-  $queue_run_max = '5',
+  $mailman_domains    = [],
+  $queue_interval     = '30m',
+  $queue_run_max      = '5',
   $queue_smtp_domains = undef,
-  $smarthost = false,
-  $sysadmins = [],
-  $transports = [],
-  $routers = []
+  $routers            = [],
+  $smarthost          = false,
+  $sysadmins          = [],
+  $transports         = [],
 ) {
 
   include ::exim::params