core: change logging from environment variable to configuration file-based

GlobalConfigurationFixture uses unit-tests.conf to determine default
and module specific logging levels. Logging will gracefully default to
INFO if unit-tests.conf is not found. See unit-tests.conf.sample for a
sample configuration file.

refs: #1375, #1267

Change-Id: Ib0c4eb4149748e6658f94ef1afa23ddd3072c0fa
diff --git a/daemon/mgmt/face-status-publisher.cpp b/daemon/mgmt/face-status-publisher.cpp
index 89c731e..3589d7b 100644
--- a/daemon/mgmt/face-status-publisher.cpp
+++ b/daemon/mgmt/face-status-publisher.cpp
@@ -3,7 +3,9 @@
  * Copyright (C) 2014 Named Data Networking Project
  * See COPYING for copyright and distribution information.
  */
+
 #include "face-status-publisher.hpp"
+#include "core/logger.hpp"
 
 namespace nfd {