lsyncd: use relative paths in exclude statement

It seems only relative paths should be used in the exclude
statement. This has probably gone unnoticed since there is a second
sync for these files.

Change-Id: Ife4c1ab05e135930da8706d96af5b23648cee800

templates/lsyncd.lua.j2

@@ -593,7 +593,7 @@ sync {
     rsync,
     source = "{{ repo_service_home_folder }}/repo",
     target = "{{ hostvars[node]['ansible_host'] }}:{{ repo_service_home_folder }}/repo",
-    exclude = {"{{ repo_git_cache_dir }}"},
+    exclude = {"{{ repo_git_cache_dirname }}"},
     rsync = {
         compress = true,
         acls = true,