Bind bootstrap and discovery roles to newly-discovered nodes by default. [1/1]

As the title suggests.

 crowbar.yml                                        |    2 +
 .../app/controllers/nodes_controller.rb            |    6 +-
 crowbar_framework/app/models/node.rb               |    8 +
 crowbar_framework/app/models/node_role.rb          |  229 ++++++++++----------
 crowbar_framework/app/models/role.rb               |   34 ++-
 5 files changed, 159 insertions(+), 120 deletions(-)

Crowbar-Pull-ID: f2dad2c18398d692a3bb26eb5af182c27059631e

Crowbar-Release: development