Start refactoring network barclamp to add per-network roles. [3/4]

This pull request series starts the work of making network definition
and usage dynamic by representing networks as roles, and IP/interface
allocations to a node as noderoles.

I also started throwing away more code we do not need.


 chef/cookbooks/bind9/recipes/default.rb |   16 ++++++++++------
 crowbar.yml                             |    3 ++-
 2 files changed, 12 insertions(+), 7 deletions(-)

Crowbar-Pull-ID: cf6cf08bb7869606011fdde39fb5680b75dc0997

Crowbar-Release: development