Reformat variable template for fai class HW4F_DESKTOP

roles/fai/templates/srv/fai/config/class/HW4F_DESKTOP.var.j2

@@ -1,20 +1,20 @@
 ### CONFIGURE TIME
-UTC=yes
-TIMEZONE=Europe/Berlin
+UTC="yes"
+TIMEZONE="Europe/Berlin"
 
 ### INSTALL PARAMETERS
 STOP_ON_ERROR=700
 MAXPACKAGES=800
 
 HOSTNAME="user-pc"
-KEYMAP=de-latin1-nodeadkeys
+KEYMAP="de-latin1-nodeadkeys"
 
 
+# USER AND PASSWORD
 ROOTPW='{{ fai_hw4f_profile_password 
         | password_hash("sha512", fai_hw4f_password_salt ) }}'
 
-# START USER AND PASSWORD
-username={{ fai_hw4f_profile_username }}
+username='{{ fai_hw4f_profile_username }}'
 USERPW='{{ fai_hw4f_profile_password
         | password_hash("sha512", fai_hw4f_password_salt ) }}'
 
@@ -23,12 +23,11 @@ SUPRESS_GNOME_INITIAL_SCREEN=1
 ### ALREADY SET IN IPXE MENU ON KERNEL CMDLINE
 #FAI_FLAGS="verbose sshd createvt menu "
 FAI_ALLOW_UNSIGNED=0
-APTPROXY=http://{{ server_name }}:3142
+APTPROXY="http://{{ server_name }}:3142"
 
 ### CONFIGURE LOG UPLOAD
 {% if fai_loguser is defined and
       fai_loguser is none %}
-### DISABLE LOG UPLOAD
 LOGUSER=
 {% elif fai_loguser is defined and
       fai_loguser is not none %}