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/config-file.cpp b/daemon/mgmt/config-file.cpp
index d0eddd5..bc1a495 100644
--- a/daemon/mgmt/config-file.cpp
+++ b/daemon/mgmt/config-file.cpp
@@ -4,8 +4,8 @@
  * See COPYING for copyright and distribution information.
  */
 
-
 #include "config-file.hpp"
+#include "core/logger.hpp"
 
 #include <boost/property_tree/info_parser.hpp>
 
@@ -105,4 +105,3 @@
 }
 
 }
-