Setting ip address as attribute and exposing bus_order_call [1/2]

This pull contains 2 changes:
1. When an ip address is allocated to a node, it is set as an attribute on the node.
2. The 1st part of the conduit calculation: bus_order has been implemented and exposed as a customer attr on the node.


 crowbar_framework/app/models/attrib_instance.rb |    5 ++++-
 crowbar_framework/app/models/service_object.rb  |   12 ++++--------
 2 files changed, 8 insertions(+), 9 deletions(-)

Crowbar-Pull-ID: fc688ffdeeaf809a3e66a8a50f4197dfcd43c390

Crowbar-Release: development