Refactor and modernize namespace declarations

Move all unit tests to namespace nfd::tests

Delete unused header core/algorithm.hpp

Change-Id: I5591f0c5f3bb5db67f8b45fae95471f8a555ca68
diff --git a/tests/daemon/fw/asf-measurements.t.cpp b/tests/daemon/fw/asf-measurements.t.cpp
index 92f1884..4de0493 100644
--- a/tests/daemon/fw/asf-measurements.t.cpp
+++ b/tests/daemon/fw/asf-measurements.t.cpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /*
- * Copyright (c) 2014-2019,  Regents of the University of California,
+ * Copyright (c) 2014-2022,  Regents of the University of California,
  *                           Arizona Board of Regents,
  *                           Colorado State University,
  *                           University Pierre & Marie Curie, Sorbonne University,
@@ -29,19 +29,14 @@
 #include "tests/daemon/global-io-fixture.hpp"
 #include "tests/daemon/face/dummy-face.hpp"
 
-namespace nfd {
-namespace fw {
-namespace asf {
-namespace tests {
-
-using namespace nfd::tests;
+namespace nfd::tests {
 
 BOOST_AUTO_TEST_SUITE(Fw)
 BOOST_AUTO_TEST_SUITE(TestAsfMeasurements)
 
 BOOST_FIXTURE_TEST_CASE(FaceInfo, GlobalIoTimeFixture)
 {
-  using asf::FaceInfo;
+  using fw::asf::FaceInfo;
   FaceInfo info(nullptr);
 
   BOOST_CHECK_EQUAL(info.getLastRtt(), FaceInfo::RTT_NO_MEASUREMENT);
@@ -79,7 +74,7 @@
 
 BOOST_FIXTURE_TEST_CASE(NamespaceInfo, GlobalIoTimeFixture)
 {
-  using asf::NamespaceInfo;
+  using fw::asf::NamespaceInfo;
   NamespaceInfo info(nullptr);
 
   BOOST_CHECK(info.getFaceInfo(1234) == nullptr);
@@ -87,14 +82,11 @@
   auto& faceInfo = info.getOrCreateFaceInfo(1234);
   BOOST_CHECK(info.getFaceInfo(1234) == &faceInfo);
 
-  this->advanceClocks(AsfMeasurements::MEASUREMENTS_LIFETIME + 1_s);
+  this->advanceClocks(fw::asf::AsfMeasurements::MEASUREMENTS_LIFETIME + 1_s);
   BOOST_CHECK(info.getFaceInfo(1234) == nullptr); // expired
 }
 
 BOOST_AUTO_TEST_SUITE_END() // TestAsfStrategy
 BOOST_AUTO_TEST_SUITE_END() // Fw
 
-} // namespace tests
-} // namespace asf
-} // namespace fw
-} // namespace nfd
+} // namespace nfd::tests