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

Change-Id: I09d3fff87f00ce8684e6e304e8327f9d03ca18bf
Refs: #2716
diff --git a/autoconfig.conf.sample b/autoconfig.conf.sample
new file mode 100644
index 0000000..f9a1b3b
--- /dev/null
+++ b/autoconfig.conf.sample
@@ -0,0 +1,3 @@
+# Enable ndn-autoconfig to run in parallel with NFD.  Disabled by default
+# enabled=true
+enabled=false