Disable the random sleep in pull-replication fetch filter

The multi-site plugin register a pull-replication fetch filter
that is sleeping randomly when the local ref isn't up-to-date
with the global ref-db, which is the normal behaviour.

The local sleep is done for retrying the operation and avoid
potential flakiness, however, it introduces a significant slowdown
which makes the fetch-based replication very slow.

Change-Id: I8553c3bc4667540d337c6f4876bc599613e3356f

setup_local_env/configs/multi-site.config

diff --git a/setup_local_env/configs/multi-site.config b/setup_local_env/configs/multi-site.config
index 9571513..17f473e 100644
--- a/setup_local_env/configs/multi-site.config
+++ b/setup_local_env/configs/multi-site.config
@@ -9,3 +9,5 @@
         projectListEventTopic = gerrit_list_project
         cacheEventTopic = gerrit_cache_eviction
 
+[replication "fetch-filter"]
+        maxRandomWaitBeforeReloadLocalVersionMs = 0
\ No newline at end of file