changed from using ls to find to handle very large number of snapshots

git-svn-id: https://svn.apache.org/repos/asf/incubator/solr/trunk@415631 13f79535-47bb-0310-9956-ffa450edef68

src/scripts/snappuller

@@ -171,7 +171,7 @@ fi
 # get directory name of latest snapshot if not specified on command line
 if [[ -z ${snap_name} ]]
 then
-    snap_name=`ssh -o StrictHostKeyChecking=no ${master_host} "ls -d ${master_data_dir}/snapshot.* 2>/dev/null"|tail -1`
+    snap_name=`ssh -o StrictHostKeyChecking=no ${master_host} "find ${master_data_dir} -name snapshot.* -print"|grep -v wip|sort -r|head -1`
 fi
 if [[ "${snap_name}" == "" ]]
 then