face: move common declarations to face-common.hpp

Change-Id: I0e3e7a93f0693b0e24ca67493a4229987e792ef4
diff --git a/daemon/mgmt/face-manager.hpp b/daemon/mgmt/face-manager.hpp
index 620ab99..4e233cb 100644
--- a/daemon/mgmt/face-manager.hpp
+++ b/daemon/mgmt/face-manager.hpp
@@ -27,6 +27,7 @@
 #define NFD_DAEMON_MGMT_FACE_MANAGER_HPP
 
 #include "manager-base.hpp"
+#include "face/face.hpp"
 #include "face/face-system.hpp"
 
 namespace nfd {