Set plugins loadPriority in test environment gerrit.config

The local test environment did not include any specific ordering
for plugins loading, leading to an incorrect propagation of events
and having async ref-update events being propagated even before
the replication was happening via the pull-replication plugin.

Also ensure that events-kafka is loaded as the last one, so
that any catch-up activity happens when the system is fully
operational.

Change-Id: Ic858e2d998cf617ec479338626a3aa1fa893072e

setup_local_env/configs/gerrit.config

diff --git a/setup_local_env/configs/gerrit.config b/setup_local_env/configs/gerrit.config
index a4d68c2..1caedae 100644
--- a/setup_local_env/configs/gerrit.config
+++ b/setup_local_env/configs/gerrit.config
@@ -42,6 +42,10 @@
     directory = cache
 [plugins]
     allowRemoteAdmin = true
+    loadPriority = healthcheck
+    loadPriority = pull-replication
+    loadPriority = multi-site
+    loadPriority = events-kafka
 [plugin "events-kafka"]
     sendAsync = true
     bootstrapServers = $BROKER_HOST:$BROKER_PORT