conf: make ChronoSync's sync interest lifetime configurable

refs: #4490

Change-Id: Id3eabeed1049d1208ba49c47206f73f798f37a35
diff --git a/tests/test-statistics.cpp b/tests/test-statistics.cpp
index c74ab38..51797e5 100644
--- a/tests/test-statistics.cpp
+++ b/tests/test-statistics.cpp
@@ -45,6 +45,8 @@
     conf.setSiteName("/site");
     conf.setRouterName("/%C1.Router/this-router");
     conf.buildRouterPrefix();
+    // Otherwise code coverage node fails with default 60 seconds lifetime
+    conf.setSyncInterestLifetime(1000);
 
     addIdentity(conf.getRouterPrefix());