Remove the expireTimeRecheck for gc-conductor docker setup

Before this change,the expireTimeRecheck for gc-conductor plugin was set
to 5 minutes. This can force the test to be running for five minutes in
order to make sure that the project entered the queue.

This change removes this flag so it will have its default value of 60s.

Change-Id: I1a4346904ba66d95ddb8dd32cfdd8b0693625181
diff --git a/src/test/docker/etc/gerrit.config b/src/test/docker/etc/gerrit.config
index 7396c38..59b5f4b 100644
--- a/src/test/docker/etc/gerrit.config
+++ b/src/test/docker/etc/gerrit.config
@@ -28,4 +28,3 @@
 	databaseName = gc
 	packed = 40
 	loose = 400
-	expireTimeRecheck = 5m