adding neutron use cases

part of restructure work

implements bp/training-manuals

Change-Id: Ieb7e74e5af1d38fb744903fc0a5f127b2df91be8
Merge "adding neutron use cases"
adding network node installing neutron

part of training guides restructuring

implements bp/training-manuals

Change-Id: I039837dde4381c9bb7251c10e44c96b6d8d15a48