Package install fails when creating symlink: No such file or directory (...)pathfinder/napps/__init__.py

[italovalcy]

Hi Kytos team,

When installing the kytos/pathfinder napp through setup.py, it fails with error "No such file or directory (...)pathfinder/napps/init.py".

That is because the setup.py is still using the function _create_file_symlink() which seems not being used anymore in other napps.

Steps to reproduce:

1. Install kytos and kytos/pathfinder dependencies
2. Clone the kytos/pathfinder
3. Run the pathfinder install:

   python setup.py develop

Expected behavior:

• Kytos/pathfinder should be installed/enabled with success

Actual behavior:

• setup.py fails with the following error:

  error: [Errno 2] No such file or directory: '/root/pathfinder/napps/__init__.py'