Fix CacheEvictionIT test setup

204 is returned when event is successfully forwarded, not 200.

Change-Id: I1e505d11299fde5a5ca374a6a3b2767309786057
diff --git a/src/test/java/com/ericsson/gerrit/plugins/highavailability/cache/CacheEvictionIT.java b/src/test/java/com/ericsson/gerrit/plugins/highavailability/cache/CacheEvictionIT.java
index bd25a1c..fc492f5 100644
--- a/src/test/java/com/ericsson/gerrit/plugins/highavailability/cache/CacheEvictionIT.java
+++ b/src/test/java/com/ericsson/gerrit/plugins/highavailability/cache/CacheEvictionIT.java
@@ -68,7 +68,7 @@
       }
     });
     givenThat(post(urlEqualTo(flushRequest))
-        .willReturn(aResponse().withStatus(HttpStatus.SC_OK)));
+        .willReturn(aResponse().withStatus(HttpStatus.SC_NO_CONTENT)));
 
     adminSshSession
         .exec("gerrit flush-caches --cache " + Constants.PROJECT_LIST);