SOLR-3889: improve utf-8 test script error message when curl call to Solr fails

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1391046 13f79535-47bb-0310-9956-ffa450edef68

solr/example/exampledocs/test_utf8.sh

@@ -27,7 +27,7 @@ curl "$URL/select?q=hello&params=explicit&wt=python" 2> /dev/null | grep 'hello'
 if [ $? = 0 ]; then
   echo "Solr server is up."
 else
-  echo "ERROR: Solr is not up."
+  echo "ERROR: Could not curl to Solr - is curl installed? Is Solr not running?"
   exit 1
 fi