Update couch_secondary_sup to not start index_server

Index server is gone and replaced by couch_views + couch_jobs applications.
diff --git a/src/couch/src/couch_secondary_sup.erl b/src/couch/src/couch_secondary_sup.erl
index 4ccd0c9..293e1b5 100644
--- a/src/couch/src/couch_secondary_sup.erl
+++ b/src/couch/src/couch_secondary_sup.erl
@@ -27,7 +27,6 @@
             dynamic}
     ],
     Daemons = [
-        {index_server, {couch_index_server, start_link, []}},
         {query_servers, {couch_proc_manager, start_link, []}},
         {vhosts, {couch_httpd_vhost, start_link, []}},
         {uuids, {couch_uuids, start, []}}