tests: IdentityManagementFixture no longer derives from BaseFixture

Also rename it to KeyChainFixture

Refs: #4528
Change-Id: Id86f4affc9c4c9ae159912430cc3e78557bf1ac2
diff --git a/tests/tools/nfdc/status-report.t.cpp b/tests/tools/nfdc/status-report.t.cpp
index d15b901..6b1cd20 100644
--- a/tests/tools/nfdc/status-report.t.cpp
+++ b/tests/tools/nfdc/status-report.t.cpp
@@ -120,7 +120,7 @@
   std::function<void()> processEventsFunc;
 };
 
-class StatusReportModulesFixture : public IdentityManagementTimeFixture
+class StatusReportModulesFixture : public UnitTestTimeFixture, public KeyChainFixture
 {
 protected:
   StatusReportModulesFixture()