core: move common.hpp to core/

Headers in core/ are now included as `#include "core/*.hpp"`.
This allows NFD to rely less on include paths when used as a submodule in
another codebase, such as ndnSIM and NFD-Android.

refs #3127

Change-Id: Ia38f3c97427e17ff7b5401281f1fe875b5d5313e
diff --git a/daemon/fw/asf-probing-module.cpp b/daemon/fw/asf-probing-module.cpp
index 097a372..d60a215 100644
--- a/daemon/fw/asf-probing-module.cpp
+++ b/daemon/fw/asf-probing-module.cpp
@@ -25,7 +25,7 @@
 
 #include "asf-probing-module.hpp"
 
-#include "random.hpp"
+#include "core/random.hpp"
 
 #include <boost/random/uniform_real_distribution.hpp>
 
diff --git a/daemon/fw/forwarder.hpp b/daemon/fw/forwarder.hpp
index 3c80419..b561d6f 100644
--- a/daemon/fw/forwarder.hpp
+++ b/daemon/fw/forwarder.hpp
@@ -26,7 +26,7 @@
 #ifndef NFD_DAEMON_FW_FORWARDER_HPP
 #define NFD_DAEMON_FW_FORWARDER_HPP
 
-#include "common.hpp"
+#include "core/common.hpp"
 #include "core/scheduler.hpp"
 #include "forwarder-counters.hpp"
 #include "face-table.hpp"
diff --git a/daemon/fw/rtt-estimator.hpp b/daemon/fw/rtt-estimator.hpp
index a830c5a..b692083 100644
--- a/daemon/fw/rtt-estimator.hpp
+++ b/daemon/fw/rtt-estimator.hpp
@@ -1,12 +1,12 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /**
- * Copyright (c) 2014  Regents of the University of California,
- *                     Arizona Board of Regents,
- *                     Colorado State University,
- *                     University Pierre & Marie Curie, Sorbonne University,
- *                     Washington University in St. Louis,
- *                     Beijing Institute of Technology,
- *                     The University of Memphis
+ * Copyright (c) 2014-2016,  Regents of the University of California,
+ *                           Arizona Board of Regents,
+ *                           Colorado State University,
+ *                           University Pierre & Marie Curie, Sorbonne University,
+ *                           Washington University in St. Louis,
+ *                           Beijing Institute of Technology,
+ *                           The University of Memphis.
  *
  * This file is part of NFD (Named Data Networking Forwarding Daemon).
  * See AUTHORS.md for complete list of NFD authors and contributors.
@@ -21,12 +21,12 @@
  *
  * You should have received a copy of the GNU General Public License along with
  * NFD, e.g., in COPYING.md file.  If not, see <http://www.gnu.org/licenses/>.
- **/
+ */
 
 #ifndef NFD_DAEMON_FW_RTT_ESTIMATOR_HPP
 #define NFD_DAEMON_FW_RTT_ESTIMATOR_HPP
 
-#include "common.hpp"
+#include "core/common.hpp"
 
 namespace nfd {
 
diff --git a/daemon/fw/strategy-info.hpp b/daemon/fw/strategy-info.hpp
index fecd8e1..133d53c 100644
--- a/daemon/fw/strategy-info.hpp
+++ b/daemon/fw/strategy-info.hpp
@@ -1,12 +1,12 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /**
- * Copyright (c) 2014,  Regents of the University of California,
- *                      Arizona Board of Regents,
- *                      Colorado State University,
- *                      University Pierre & Marie Curie, Sorbonne University,
- *                      Washington University in St. Louis,
- *                      Beijing Institute of Technology,
- *                      The University of Memphis
+ * Copyright (c) 2014-2016,  Regents of the University of California,
+ *                           Arizona Board of Regents,
+ *                           Colorado State University,
+ *                           University Pierre & Marie Curie, Sorbonne University,
+ *                           Washington University in St. Louis,
+ *                           Beijing Institute of Technology,
+ *                           The University of Memphis.
  *
  * This file is part of NFD (Named Data Networking Forwarding Daemon).
  * See AUTHORS.md for complete list of NFD authors and contributors.
@@ -26,7 +26,7 @@
 #ifndef NFD_DAEMON_FW_STRATEGY_INFO_HPP
 #define NFD_DAEMON_FW_STRATEGY_INFO_HPP
 
-#include "common.hpp"
+#include "core/common.hpp"
 
 namespace nfd {
 namespace fw {
diff --git a/daemon/fw/strategy-registry.hpp b/daemon/fw/strategy-registry.hpp
index 6675004..83e9f73 100644
--- a/daemon/fw/strategy-registry.hpp
+++ b/daemon/fw/strategy-registry.hpp
@@ -26,7 +26,7 @@
 #ifndef NFD_DAEMON_FW_STRATEGY_REGISTRY_HPP
 #define NFD_DAEMON_FW_STRATEGY_REGISTRY_HPP
 
-#include "common.hpp"
+#include "core/common.hpp"
 
 namespace nfd {