BSC: Make encryption a5 a puppet param

modules/rhizo_base/manifests/osmocom.pp

@@ -13,6 +13,7 @@ class rhizo_base::osmocom {
   $network_name    = $rhizo_base::network_name
   $mcc             = $rhizo_base::mcc
   $mnc             = $rhizo_base::mnc
+  $a5              = "1"
   $bts             = hiera('rhizo::bts')
 
   $smsc_password   = $rhizo_base::smsc_password

modules/rhizo_base/templates/osmo-bsc-head.erb

@@ -63,7 +63,7 @@ cs7 instance 0
 network
  network country code <%= @mcc %>
  mobile network code <%= @mnc %>
- encryption a5 1
+ encryption a5 <%= @a5 %>
  neci 1
  paging any use tch 0
  handover 0