Support for feeding RBSC

[mandelsoft]

To support the inbound process for SAPs delivery channel (RBSC=repository based shipment channel) we need two basic extensions of the OCM command line tool:

• provide a check command to check whether a complete component version graph has been imported per value transport.
  It must check whether along the component version references only local access methods are used.

(Already implemented:)

• the transfer command must be able to write a yaml/json file describing all the component versions, which have been transported
  (with the --recursive) options. This will be requested by a new option allowing to specify the bom output file.

[robertwol]

@ccwienk @ikhandamirov
Could you confirm if this will be required for the RBSC work you doing and/or if you can provide additional specific requirements for OCM.

[ikhandamirov]

@mandelsoft , do I understand correctly that the completeness check actually checks two things:

1. That all referenced components are available in the given repository
2. That all referenced external resources are present as local blobs

Is my understanding correct?