code rebased with contribution from SLB

Diego Molteni requested to merge slb/dm3/code-contribuion-02-2021 into master
  • reviewed the generic configuration model internally used by the utility
  • removed the region request in the subproject mk command and moved into the abstraction (google only)
  • reviewed the help menus and the main readme
  • added the config init/show command to initialize and display the utility configurations
  • extended the patch method to patch subproject ACLs

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