Make configuration of binds more flexible; add support for configuring data bag names

A few changes:
* Make configuration of binds more flexible (default behavior was listen on all interfaces for the specified port)
* Add support for configuring data bag names (default names are unchanged for BC; allows multiple squid deployments per environment)
* Removed allow on localnets by default - some people deploy to cloud environments where 10/8 is used for private networks (like in Rackspace)