tests: unit-tests-{core,tools} no longer require a global io_service

BaseFixture is moved to tests/daemon and renamed to GlobalIoFixture

Refs: #4528
Change-Id: If9184e9f7f1d6072b0103d3ea3ca6c31a9e505c8
diff --git a/tests/daemon/rib-io-fixture.cpp b/tests/daemon/rib-io-fixture.cpp
index 98563a9..768c5cc 100644
--- a/tests/daemon/rib-io-fixture.cpp
+++ b/tests/daemon/rib-io-fixture.cpp
@@ -24,6 +24,7 @@
  */
 
 #include "tests/daemon/rib-io-fixture.hpp"
+#include "tests/test-common.hpp"
 #include "daemon/global.hpp"
 
 #include <boost/exception/diagnostic_information.hpp>
@@ -121,6 +122,11 @@
   } while (nHandlersRun > 0);
 }
 
+RibIoTimeFixture::RibIoTimeFixture()
+  : ClockFixture(g_io)
+{
+}
+
 void
 RibIoTimeFixture::pollAfterClockTick()
 {