CreateChangesTriggeringGc: Fix test timing

This change replaces the DefaultSecondsToNextEvaluation by
secondsToNextEvaluation in the CreateChangesTriggeringGc scenario. This
happens because this variable can be configured by an environment
variable instead of being a fixed value.

Change-Id: I46d05fc855efa2779057cec38caab1b477230ffc

src/test/scala/com/ericsson/gerrit/plugins/gcconductor/scenarios/CreateChangesTriggeringGc.scala

diff --git a/src/test/scala/com/ericsson/gerrit/plugins/gcconductor/scenarios/CreateChangesTriggeringGc.scala b/src/test/scala/com/ericsson/gerrit/plugins/gcconductor/scenarios/CreateChangesTriggeringGc.scala
index c6a4534..079f89c 100644
--- a/src/test/scala/com/ericsson/gerrit/plugins/gcconductor/scenarios/CreateChangesTriggeringGc.scala
+++ b/src/test/scala/com/ericsson/gerrit/plugins/gcconductor/scenarios/CreateChangesTriggeringGc.scala
@@ -63,7 +63,7 @@
     test.inject(
       nothingFor(stepWaitTime(this) seconds),
       constantUsersPerSec(changesPerSecond) during (secondsToChanges seconds),
-      nothingFor(DefaultSecondsToNextEvaluation seconds),
+      nothingFor(secondsToNextEvaluation seconds),
       nothingFor(secondsForLastEvaluation / 2 seconds),
       atOnceUsers(ChangesForLastEvaluation),
       nothingFor(secondsForLastEvaluation / 2 seconds)