mgmt: implement cs/config command

refs #4050

Change-Id: I86b050ac062855bad66197a775a502007e687d8d
diff --git a/nfd.conf.sample.in b/nfd.conf.sample.in
index 10b49c3..0370cf9 100644
--- a/nfd.conf.sample.in
+++ b/nfd.conf.sample.in
@@ -251,6 +251,7 @@
     {
       faces
       fib
+      cs
       strategy-choice
     }
   }