User modules overlap standart modules

If I have a code:
```
from selenium import webdriver # standart python lib "selenium"
from utils.selenium import create_driver # my (user) local module with utils/helper functions for work with selenium
```
And use pipreqs for it, the pipreqs ignore selenium package

No file or test is named. Reproduce the example with pipreqs, then trace how imports are resolved and filtered when a user module overlaps a package name. Done means pipreqs includes the selenium dependency despite the local utils.selenium import, with a regression test covering this example.

Written by the indexing model from the issue text.