Add LAC swapping for osmo-msc

Make LAC config availble to the shell.
Run a script on MSC restart to change the lac and write a state flag to disk.

Due to the fact that osmo-msc may restart due to crash or power outage
hence loosing all VLR state, force all UE to send a LUR by changing the LAC
on all BTS via CTRL commands to osmo-bsc.

modules/rhizo_base/templates/vars.sh.erb

@@ -14,10 +14,12 @@ DID[<%= index %>]=<%= did %>
 
 #BTSs IP addresses (for amps etc)
 declare -a BTS
+declare -a LAC
 declare -a BTS_MASTER
 
 <% @bts.each_with_index do |bts, index| -%>
 BTS[<%= index %>]=<%= bts["ip"] %>
+LAC[<%= index %>]=<%= bts["lac"] %>
 <% if bts ["model"] == '2050M' -%>
 BTS_MASTER[<%= index %>]=<%= bts["ip"] %>
 <% end -%>