tests: resetGlobalIoService for every test

All tests must use BaseFixture or a fixture derived from it to get this feature.

This commit also fixes a few warnings in tests/mgmt, and moves test cases into nfd::tests namespace.

refs #1290

Change-Id: I891441a5abce170e35648d463f7157b18429f79f
diff --git a/tests/table/measurements-accessor.cpp b/tests/table/measurements-accessor.cpp
index 9738701..3d7e24f 100644
--- a/tests/table/measurements-accessor.cpp
+++ b/tests/table/measurements-accessor.cpp
@@ -7,11 +7,12 @@
 #include "table/measurements-accessor.hpp"
 #include "fw/forwarder.hpp"
 
-#include <boost/test/unit_test.hpp>
+#include "tests/test-common.hpp"
 
 namespace nfd {
+namespace tests {
 
-BOOST_AUTO_TEST_SUITE(TableMeasurementsAccessor)
+BOOST_FIXTURE_TEST_SUITE(TableMeasurementsAccessor, BaseFixture)
 
 class MeasurementsAccessorTestStrategy : public fw::Strategy
 {
@@ -47,7 +48,6 @@
 
 BOOST_AUTO_TEST_CASE(Access)
 {
-  resetGlobalIoService();
   Forwarder forwarder;
 
   shared_ptr<MeasurementsAccessorTestStrategy> strategy1 =
@@ -87,4 +87,5 @@
 
 BOOST_AUTO_TEST_SUITE_END()
 
+} // namespace tests
 } // namespace nfd