apache-frontend: Major clean up on the template

  Reduce a bit the number of sections also for create directories
  Move all 'set's and 'do's to earliest as possible, to keep buildout syntax more evident
  Drop duplicated logics and 'if's reducing general code

software/apache-frontend/common.cfg

@@ -66,7 +66,7 @@ mode = 0644
 [template-slave-list]
 recipe = slapos.recipe.build:download
 url = ${:_profile_base_location_}/templates/apache-custom-slave-list.cfg.in
-md5sum = ee18e498f2868735e0c0ddf209454c37
+md5sum = 8fd6f0277883d893e01e71238091e81e
 mode = 640
 
 [template-slave-configuration]