Error out if we cannot initialize the APT lock

If we do not acquire an APT lock, we should immediately bail out because
we have no insight into what might be going wrong on that machine

Thanks: Matthew Maslak

apt_offline_core/AptOfflineCoreLib.py

@@ -1537,7 +1537,9 @@ def __init__(self, args):
                 return False
 
             AptOfflineLib.Archiver.__init__(self)
-            LockAPT.__init__(self, apt_lists_lock, apt_packages_lock)
+            if not LockAPT.__init__(self, apt_lists_lock, apt_packages_lock):
+                log.err("Couldn't initialize lock on APT dataase\n")
+                return False
 
             if MagicLib is False:
                 log.err("Please ensure libmagic is installed\n")