Display note that the MySQL connect error isn't an actual problem

The:

| ERROR 2002 (HY000): Can't connect to local MySQL server through socket ...

gets displayed several times, though it's not an issue.
Seems to be some async foo or race condition I couldn't identify
yet, until it's resolved display a message to the user so nobody
thinks that's a real error.

From: Michael Prokop <mprokop@sipwise.com>

deployment.sh

@@ -1257,10 +1257,13 @@ upload_db_dump() {
 
   # mysqldump writes errors to stdout, muhaha...
   if ! grep -q 'Dump completed on' /dump.db ; then
-    echo "Error: invalid data inside database dump."
+    echo "Error: invalid data inside database dump." >&2
     exit 1
   fi
 
+  echo "NOTE: you can safely IGNORE the message stating:"
+  echo "        ERROR 2002 (HY000): Can't connect to local MySQL server through socket ..."
+  echo "      listed above. If you're seeing this note here everything went fine."
   upload_file "/dump.db"
 }