Add role to install nfs-server, cleanup roles and configuration

- use generic media_dirs including vdr recdir, loop over them to
  create directories, configure samba, nfs, etc.
- add role to install an configure nfs-kernel-server
- cleanup roles
- add custom fact modules

roles/samba-config/tasks/main.yml

@@ -3,7 +3,7 @@
 # TODO:
 #- name: divert original smbd.conf
 
-- name: create smb.conf.custom
+- name: touch smb.conf.custom
   file:
     state: touch
     dest: '/etc/samba/smb.conf.custom'