Added network API support for enable_interface [2/2]

Added support for enable_interface network API call
Also fixed network API BDD test that was accidently broken by a prior pull


 BDD/features/networks.feature                      |   10 ++++
 BDD/networks.erl                                   |   52 +++++++++++++++++---
 bin/crowbar_network                                |   21 ++++++++
 .../app/controllers/network_controller.rb          |   12 +++++
 crowbar_framework/app/models/interface.rb          |    1 +
 crowbar_framework/app/models/network.rb            |   27 +++++++++-
 crowbar_framework/app/models/network_service.rb    |   31 ++++++++++--
 .../20130123083500_create_interfaces_networks.rb   |   23 +++++++++
 crowbar_framework/test/unit/network_model_test.rb  |   29 +++++++++++
 .../test/unit/network_service_test.rb              |   49 ++++++++++++++++++
 10 files changed, 243 insertions(+), 12 deletions(-)

Crowbar-Pull-ID: fe0917c7e9a995496f74a4c4b8261c69cda8201c

Crowbar-Release: development