Use ndn-cxx logging facility

refs: #3949

Change-Id: I5d0931c3576c88e0c2fa52bdd0a716946400e0bc
diff --git a/nlsr.conf b/nlsr.conf
index 378f63c..d5421ed 100644
--- a/nlsr.conf
+++ b/nlsr.conf
@@ -19,24 +19,7 @@
   ; InterestLifetime (in seconds) for LSA fetching
   lsa-interest-lifetime 4    ; default value 4. Valid values 1-60
 
-  ; log-level is used to set the logging level for NLSR.
-  ; All debugging levels listed above the selected value are enabled.
-  ;
-  ; Valid values:
-  ;
-  ;  NONE ; no messages
-  ;  ERROR ; error messages
-  ;  WARN ; warning messages
-  ;  INFO ; informational messages (default)
-  ;  DEBUG ; debugging messages
-  ;  TRACE ; trace messages (most verbose)
-  ;  ALL ; all messages
-
-  log-level  INFO
-
-  log-dir       /var/log/nlsr/         ; path for log directory (Absolute path)
-  seq-dir       /var/lib/nlsr/         ; path for sequence directory (Absolute path)
-  ;log4cxx-conf /path/to/log4cxx-conf  ; path for log4cxx configuration file (Absolute path)
+  seq-dir       /var/lib/nlsr        ; path for sequence directory (Absolute path)
 }
 
 ; the neighbor's section contains the configuration for router's neighbors and hellos behavior