Change #include style

Header files are now always included with their path from the
project's root directory rather than the path relative to
the includer.

Change-Id: If39b8510eef8da00baf5fe88337c45dbdf8c766e
Refs: #3084
diff --git a/tests/unit/identity-management-time-fixture.hpp b/tests/unit/identity-management-time-fixture.hpp
index cafa9c6..6bff890 100644
--- a/tests/unit/identity-management-time-fixture.hpp
+++ b/tests/unit/identity-management-time-fixture.hpp
@@ -19,11 +19,11 @@
  * See AUTHORS.md for complete list of ndn-cxx authors and contributors.
  */
 
-#ifndef NDN_TESTS_UNIT_TESTS_IDENTITY_MANAGEMENT_TIME_FIXTURE_HPP
-#define NDN_TESTS_UNIT_TESTS_IDENTITY_MANAGEMENT_TIME_FIXTURE_HPP
+#ifndef NDN_TESTS_UNIT_IDENTITY_MANAGEMENT_TIME_FIXTURE_HPP
+#define NDN_TESTS_UNIT_IDENTITY_MANAGEMENT_TIME_FIXTURE_HPP
 
-#include "identity-management-fixture.hpp"
-#include "unit-test-time-fixture.hpp"
+#include "tests/identity-management-fixture.hpp"
+#include "tests/unit/unit-test-time-fixture.hpp"
 
 namespace ndn {
 namespace tests {
@@ -36,4 +36,4 @@
 } // namespace tests
 } // namespace ndn
 
-#endif // NDN_TESTS_UNIT_TESTS_IDENTITY_MANAGEMENT_TIME_FIXTURE_HPP
+#endif // NDN_TESTS_UNIT_IDENTITY_MANAGEMENT_TIME_FIXTURE_HPP