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/face/ethernet-fixture.hpp b/tests/daemon/face/ethernet-fixture.hpp
index 0a75fcc..5a8160e 100644
--- a/tests/daemon/face/ethernet-fixture.hpp
+++ b/tests/daemon/face/ethernet-fixture.hpp
@@ -38,9 +38,9 @@
 
 using namespace nfd::tests;
 
-/** \brief a fixture providing a list of EthernetTransport-capable network interfaces
+/** \brief Fixture providing a list of EthernetTransport-capable network interfaces.
  */
-class EthernetFixture : public virtual BaseFixture
+class EthernetFixture : public virtual GlobalIoFixture
 {
 protected:
   EthernetFixture()