CORD-632 management DHCP range custom configuration

Change-Id: I495b36e44671d97efbe09e3bd847cf06fa3de93c
diff --git a/config/sample.yml b/config/sample.yml
index ee8e749..07db51e 100644
--- a/config/sample.yml
+++ b/config/sample.yml
@@ -35,6 +35,8 @@
   #fabric_range_low: '10.6.1.2'
   #fabric_range_high: '10.6.1.100'
   management_ip: '10.6.0.1/24'
+  #management_range_low: '10.6.0.2'
+  #management_range_high: '10.6.0.127'
   external_ip: '47.135.132.21/24'
   #external_iface: 'eth2'
   management_network: 10.6.0.0/24