[#6480] Refactor import_tool() params

- project and user are the only guaranteed params for every
  importer, and should therefore be the only positional args
- All other args to import_tool, even project_name (which refers
  to the name of the project being imported), should be passed
  by keyword.

Signed-off-by: Tim Van Steenburgh <tvansteenburgh@gmail.com>
10 files changed