Send error message to stderr.

SVN: 26503

openbis/dist/server/startup.sh

@@ -9,7 +9,7 @@ checkNotRoot
 
 `dirname "$0"`/status.sh -q
 if [ $? -eq 0 ]; then
-  echo openBIS AS already running, shut it down before starting a new one.
+  echo openBIS AS already running, shut it down before starting a new one. > /dev/stderr
   exit 1
 fi