Added ipv6 node module for IPv4/v6 address manipulations/validations
Added ipv6 node module for IPv4/v6 address manipulations/validations

Change-Id: Ief61d188f42fdfd971205f0e866ee5fbb2c9ba4f

JioCloud/contrail-webui-third-party,biswajit-mandal/contrail-webui-third-party,varunarya10/contrail-webui-third-party,absingla/contrail-webui-third-party