Description of problem:

Interacting with the RHEL 8 Beta, I noticed that it appears to include this Fedora change.

https://fedoraproject.org/wiki/Changes/Making_sudo_pip_safe

However, it is still possible to corrupt system packages running pip as root.  Upgrading a python module that is owned by a system package installs the new version in `/usr/local/lib/python3.6/site-packages` as desired, but removes the files in `/usr/lib/python3.6/site-packages`, which corrupts the system package.

    [root@el8 ~]# /usr/libexec/platform-python -c 'import setuptools; print(setuptools.version.__version__)'
    39.2.0
    [root@el8 ~]# rpm -V python3-setuptools | grep -c missing
    0
    [root@el8 ~]# pip3.6 install -U setuptools &> /dev/null
    [root@el8 ~]# /usr/libexec/platform-python -c 'import setuptools; print(setuptools.version.__version__)'
    40.6.2
    [root@el8 ~]# rpm -V python3-setuptools | grep -c missing
    182

This same behavior can be observed in Fedora 28.

    [root@f28 ~]# python3 -c 'import setuptools; print(setuptools.version.__version__)'
    39.2.0
    [root@f28 ~]# rpm -V python3-setuptools | grep -c missing
    0
    [root@f28 ~]# pip3.6 install -U setuptools &> /dev/null
    [root@f28 ~]# python3 -c 'import setuptools; print(setuptools.version.__version__)'
    40.6.2
    [root@f28 ~]# rpm -V python3-setuptools | grep -c missing
    182

Something changed between Fedora 28 and 29, because it does the right thing now.

    [root@f29 ~]# python3 -c 'import setuptools; print(setuptools.version.__version__)'
    40.4.3
    [root@f29 ~]# rpm -V python3-setuptools | grep -c missing
    0
    [root@f29 ~]# pip3.7 install -U setuptools &> /dev/null
    [root@f29 ~]# python3 -c 'import setuptools; print(setuptools.version.__version__)'
    40.6.2
    [root@f29 ~]# rpm -V python3-setuptools | grep -c missing
    0

Please track down this change from F28->F29 and backport it to EL8.


Version-Release number of selected component (if applicable):
python3-pip-9.0.3-4.el8.noarch


Steps to Reproduce:
1. pip3.6 install -U setuptools
2. rpm -V python3-setuptools


Actual results:
Corrupt system package, files missing from `/usr/lib/python3.6/site-packages`.


Expected results:
Files from system package left alone.