BROOKLYN-81: Refuse to reload security provider if none set
Mark Cidr class Serializable
BindDnsServer improvements

* Rebinds
* Supports CNAME records
* Integration tests and more live tests
This closes #263

* github/pr/263:
  BindDnsServer improvements
  Mark Cidr class Serializable
  BROOKLYN-81: Refuse to reload security provider if none set