Fixed /etc/hosts update for external hdfs
Fixed /etc/hosts update for external hdfs

Before the change /etc/hosts were growing infinitely

Change-Id: I303c013fc0fa85f1826aa60106846a3b7b214be3
Closes-Bug: #1326114

bigfootproject/sahara,zhujzhuo/Sahara,keedio/sahara,henaras/sahara,esikachev/sahara-backup,zhangjunli177/sahara,xme1226/sahara,zhangjunli177/sahara,henaras/sahara,citrix-openstack-build/sahara,citrix-openstack-build/sahara,openstack/sahara,tellesnobrega/storm_plugin,matips/iosr-2015,matips/iosr-2015,bigfootproject/sahara,esikachev/sahara-backup,ekasitk/sahara,esikachev/scenario,crobby/sahara,tellesnobrega/sahara,mapr/sahara,keedio/sahara,ekasitk/sahara,zhangjunli177/sahara,tellesnobrega/storm_plugin,henaras/sahara,xme1226/sahara,citrix-openstack-build/sahara,egafford/sahara,zhujzhuo/Sahara,egafford/sahara,bigfootproject/sahara,crobby/sahara,esikachev/sahara-backup,keedio/sahara,redhat-openstack/sahara,redhat-openstack/sahara,zhujzhuo/Sahara,crobby/sahara,redhat-openstack/sahara,tellesnobrega/storm_plugin,tellesnobrega/sahara,esikachev/scenario,mapr/sahara,mapr/sahara,ekasitk/sahara,esikachev/scenario,openstack/sahara,xme1226/sahara,matips/iosr-2015