Allocate memory for ip address in the flow request
Allocate memory for ip address in the flow request

Post ipv6 support, the type of the member that held the ip address
has changed from an integer to a pointer. Hence, memory also needs
to be allocated whenever we want to send a request to the datapath
for creating/deleting flows.

Change-Id: If38085c061858338d0ba87016d6c55bd1cd7aebc
Closes-BUG: #1539813

codilime/contrail-vrouter,codilime/contrail-vrouter,codilime/contrail-vrouter,codilime/contrail-vrouter