wscript: install nlsr.conf as sample in the system

refs: #4197

Change-Id: If4fa9282f71661450950d8d6e44bf2ac4fe2bcee
diff --git a/wscript b/wscript
index c469a62..961c327 100644
--- a/wscript
+++ b/wscript
@@ -122,6 +122,12 @@
         use='nlsr-objects BOOST',
         )
 
+    bld(features="subst",
+        source='nlsr.conf',
+        target='nlsr.conf.sample',
+        install_path="${SYSCONFDIR}/ndn",
+    )
+
     if bld.env['WITH_TESTS']:
         bld.recurse('tests')
         bld.recurse('tests-integrated')