**breaking change** nlsr.conf: rename seq-dir as state-dir

update: conf file in seperate directory for runtime modification

refs:  #4823

Change-Id: I5378d831294814e382ad23a9e522d0b576180f20
diff --git a/nlsr.conf b/nlsr.conf
index 8e574f5..791cbf0 100644
--- a/nlsr.conf
+++ b/nlsr.conf
@@ -25,7 +25,7 @@
   ; sync interest lifetime of ChronoSync/PSync in milliseconds
   sync-interest-lifetime 60000  ; default value 60000. Valid values 1000-120,000
 
-  seq-dir       /var/lib/nlsr        ; path for sequence directory (Absolute path)
+  state-dir       /var/lib/nlsr        ; path for intermediate state files including sequence directory (Absolute path)
 }
 
 ; the neighbor's section contains the configuration for router's neighbors and hellos behavior