Switch to address_for_service for getting IP

This change switches to using the address_for_service method for
retrieving an IP so that this recipe will work with interfaces
that have multiple IPs.
Merge pull request #9 from cdearborn/pull-req-master-6e3e36380d0a34f01231be273fba21d298f5b928

Update messaging barclamp to use IP from networking info [1/1]