Modify content generator based on Koji dev feedback
    
    - Change the type of build from modulemd to just module
    - Change build output type from modulemd to file
    - Provide the typeinfo also for the modulemd.yaml output
    - Convert dashes to underscores for build version (i.e. mbs stream).
      koji build versions can't have dashes - we can provide real value in
      the extra section
    - Add name, stream, version data into build extra section
    - Add tool information for modulemd
    - Add buildroot components from host running mbs
    - Added few methods licensed under BSD 3-clause (from atomic-reactor)