fix host, pid, tid order

using "differenthost" (== not the current hostname) makes
the process_alive check always return True (to play safe,
because in can not check for processes on other hosts).

src/borg/testsuite/locking.py

@@ -157,8 +157,11 @@ class TestExclusiveLock:
         exception_counter = SynchronizedCounter()
         print_lock = ThreadingLock()
         thread = None
+        host_id, process_id = "differenthost", 1234
         for thread_id in range(RACE_TEST_NUM_THREADS):
-            thread = Thread(target=acquire_release_loop, args=(('foo', thread_id, 0), RACE_TEST_DURATION, thread_id, lock_owner_counter, exception_counter, print_lock, thread))
+            thread = Thread(target=acquire_release_loop,
+                            args=((host_id, process_id, thread_id), RACE_TEST_DURATION, thread_id,
+                                  lock_owner_counter, exception_counter, print_lock, thread))
             thread.start()
         thread.join()  # joining the last thread