Fix. problem when same session can release task multiple times.

It can be when originate has group dial-string. So it call `api_hangup_hook`
for each channel.
Now we release task in `retry.lua` only if originate success and this is same channel
which execute `exec.lua`.
If originate fail we release task `next.lua`

resources/install/scripts/fax_queue/exec.lua

@@ -132,6 +132,12 @@ local function check()
 end
 
 local function task()
+  local session_uuid = session:getVariable('uuid')
+
+  session:setVariable('fax_queue_task_session', session_uuid)
+
+  log.infof("SESSION UUID: %s", session_uuid)
+
   session:waitForAnswer(session)
 
   while not session:answered() do