Send gratuitous arp on ns_ipaddr2 start

Send gratuitous arps on the host node
after ip address is started using
ns_IPaddr2 resource agent
Script sends 5 gratuitous/unsolicited ARP
packets every 200 milliseconds from the
NIC of corresponding interface with
source IP set to the corresponding IP

Change-Id: I1a1b8079e93c5d4cd2ab9b6b17f7686160950734
Closes-bug: #1310676
Merge "Send gratuitous arp on ns_ipaddr2 start" into stable/4.1