Add static routes to NFDs in parallel

This allows setting up static routing in large
topologies in a reasonable time. Some timer values
are also reduced, seems to work fine to me

Change-Id: I112cfd216615a100db6dc18182db40ba614d83e6
diff --git a/minindn/helpers/nfdc.py b/minindn/helpers/nfdc.py
index 9e1e184..50c005b 100644
--- a/minindn/helpers/nfdc.py
+++ b/minindn/helpers/nfdc.py
@@ -24,7 +24,9 @@
 from mininet.log import debug
 from minindn.minindn import Minindn
 
-SLEEP_TIME = 0.2
+# If needed (e.g. to speed up the process), use a smaller (or larger value) 
+# based on your machines resource (CPU, memory)
+SLEEP_TIME = 0.1
 
 class Nfdc(object):
     STRATEGY_ASF = 'asf'