Put PID/Lock file IN temporal directory, not next to.

Likely typo. We have no guarantee we can write in the parent of the
temporal directory.

example/aitf-clean-temporal

@@ -106,7 +106,7 @@ def main():
         log_download_report = no_cleanup_report
 
     stats = csppfetch.CleaningStats()
-    with PIDLockFile(args.temporal_dir+"cleaning-process.pid") as has_lock:
+    with PIDLockFile(args.temporal_dir+"/cleaning-process.pid") as has_lock:
         if has_lock:
             csppfetch.delete_old_files(args.temporal_dir+"/L1b", args.oldest, stats)
             csppfetch.delete_old_files(args.temporal_dir+"/L2",  args.oldest, stats)