Allocated ip available as attr, plus get_bus_map proof of concept [1/2]

This pull request includes:
1. Setting the allocate ip address as an attribute on the Node
2. The first piece of the conduit calculation (get_bus_map) along with a
   custom AttribInstance that makes the bus map for a node publicly available.
These two components are the first to exercise setting a Jig attribute on a node and making a custom attribute that is set on a node.


 crowbar_framework/app/models/node.rb |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

Crowbar-Pull-ID: 619186241d4e828e4b1bca58c144dc8a9442c5b7

Crowbar-Release: development