tools: Automatically start ndn-autoconfig in nfd-start, if enabled in autoconfig.conf

Change-Id: I09d3fff87f00ce8684e6e304e8327f9d03ca18bf
Refs: #2716
diff --git a/wscript b/wscript
index 2abe872..4b0ca05 100644
--- a/wscript
+++ b/wscript
@@ -240,6 +240,8 @@
             install_path="${MANDIR}/",
             VERSION=VERSION)
 
+    bld.install_files("${SYSCONFDIR}/ndn", "autoconfig.conf.sample")
+
 def docs(bld):
     from waflib import Options
     Options.commands = ['doxygen', 'sphinx'] + Options.commands