Always have ./clean.sh run ./unstack.sh

There was detection code in clean.sh to only run it if a screen
session was found, but in systemd world, that's obviously not
true. This was causing me (and others) substantial confusion.

Change-Id: I204e94cd86b8c67012aabfca74796e593151c3a4
diff --git a/clean.sh b/clean.sh
index 90b21eb..ef38fbf 100755
--- a/clean.sh
+++ b/clean.sh
@@ -64,13 +64,8 @@
     done
 fi
 
-# See if there is anything running...
-# need to adapt when run_service is merged
-SESSION=$(screen -ls | awk '/[0-9].stack/ { print $1 }')
-if [[ -n "$SESSION" ]]; then
-    # Let unstack.sh do its thing first
-    $TOP_DIR/unstack.sh --all
-fi
+# Let unstack.sh do its thing first
+$TOP_DIR/unstack.sh --all
 
 # Run extras
 # ==========