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/core/config-file.t.cpp b/tests/core/config-file.t.cpp
index 0be1cf1..c2ceb85 100644
--- a/tests/core/config-file.t.cpp
+++ b/tests/core/config-file.t.cpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /*
- * Copyright (c) 2014-2018,  Regents of the University of California,
+ * Copyright (c) 2014-2019,  Regents of the University of California,
  *                           Arizona Board of Regents,
  *                           Colorado State University,
  *                           University Pierre & Marie Curie, Sorbonne University,
@@ -34,7 +34,7 @@
 namespace nfd {
 namespace tests {
 
-BOOST_FIXTURE_TEST_SUITE(TestConfigFile, BaseFixture)
+BOOST_AUTO_TEST_SUITE(TestConfigFile)
 
 static const std::string CONFIG = R"CONFIG(
   a
@@ -283,7 +283,7 @@
   BOOST_CHECK(sub2.allCallbacksFired());
 }
 
-class MissingCallbackFixture : public BaseFixture
+class MissingCallbackFixture
 {
 public:
   void