Removed q-vpn from the list of dirty logs

The last gate that was producing the log was kilo. Since it's EOL now,
remove the reference.

Change-Id: I40cf34f53dcd9c3169922dc3b84756dfef09a381
diff --git a/tools/check_logs.py b/tools/check_logs.py
index fa7129d..e34dec3 100755
--- a/tools/check_logs.py
+++ b/tools/check_logs.py
@@ -54,7 +54,6 @@
     'q-meta',
     'q-metering',
     'q-svc',
-    'q-vpn',
     's-proxy'])