`import-self` false positive when importing non-existing module from current package

[vlad0337187]

Steps to reproduce

1. create some module
2. try to import non-existing module from current package in __init__.py
3. run pylint ./

Current behavior

• raises W0406: Module import itself (import-self)

Expected behavior

• should raise something like X0000: Module import not found (import-missing)

pylint --version output

pylint 2.5.3
astroid 2.4.2
Python 3.8.3 (default, May 29 2020, 00:00:00) 
[GCC 10.1.1 20200507 (Red Hat 10.1.1-1)]

Reproduce case

• download this .zip: pylint_false_positive_import_self.zip
• unpack it
• make unpacked directory - current (cd command)
• run pipenv install (to install pylint, create venv)
• run pipenv run pylint ./

[dubiousjim]

Related issues: #3665, #5151, #6535, #7289