On CentOS 8.3 systemd-python installation is broken

[serenico]

Because of a know issue [1] on systemd package on CentOS 8.3 DevStack fails installing systemd-python package

[1] https://bugzilla.redhat.com/show_bug.cgi?id=1862714

2020-12-08 14:57:43.233698 | controller | + inc/python:pip_install:193 : sudo -H LC_ALL=en_US.UTF-8 SETUPTOOLS_USE_DISTUTILS=stdlib http_proxy= https_proxy= no_proxy= PIP_FIND_LINKS= SETUPTOOLS_SYS_PATH_TECHNIQUE=rewrite python3.6 -m pip install -c /opt/stack/requirements/upper-constraints.txt systemd-python
2020-12-08 14:57:44.260164 | controller | Looking in indexes: https://mirror.bhs1.ovh.opendev.org/pypi/simple, https://mirror.bhs1.ovh.opendev.org/wheel/centos-8.2-x86_64
2020-12-08 14:57:44.318324 | controller | Collecting systemd-python===234
2020-12-08 14:57:44.334685 | controller | Downloading https://mirror.bhs1.ovh.opendev.org/pypifiles/packages/e8/a8/00ba0f605837a8f69523e6c3a4fb14675a6430c163f836540129c50b3aef/systemd-python-234.tar.gz (53 kB)
2020-12-08 14:57:44.582164 | controller | ERROR: Command errored out with exit status 1:
2020-12-08 14:57:44.582289 | controller | command: /usr/bin/python3.6 -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/tmp/pip-install-yowlonuc/systemd-python/setup.py'"'"'; __file__='"'"'/tmp/pip-install-yowlonuc/systemd-python/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' egg_info --egg-base /tmp/pip-pip-egg-info-39afzb_l
2020-12-08 14:57:44.582321 | controller | cwd: /tmp/pip-install-yowlonuc/systemd-python/
2020-12-08 14:57:44.582346 | controller | Complete output (12 lines):
2020-12-08 14:57:44.582365 | controller | Cannot find libsystemd or libsystemd-journal:
2020-12-08 14:57:44.582387 | controller |
2020-12-08 14:57:44.582410 | controller | Package libsystemd was not found in the pkg-config search path.
2020-12-08 14:57:44.582431 | controller | Perhaps you should add the directory containing `libsystemd.pc'
2020-12-08 14:57:44.582499 | controller | to the PKG_CONFIG_PATH environment variable
2020-12-08 14:57:44.582530 | controller | Package 'libsystemd', required by 'virtual:world', not found
2020-12-08 14:57:44.582554 | controller |
2020-12-08 14:57:44.582826 | controller | Package libsystemd-journal was not found in the pkg-config search path.
2020-12-08 14:57:44.582897 | controller | Perhaps you should add the directory containing `libsystemd-journal.pc'
2020-12-08 14:57:44.582922 | controller | to the PKG_CONFIG_PATH environment variable
2020-12-08 14:57:44.582942 | controller | Package 'libsystemd-journal', required by 'virtual:world', not found
2020-12-08 14:57:44.582960 | controller |
2020-12-08 14:57:44.582979 | controller | ----------------------------------------
2020-12-08 14:57:44.583666 | controller | ERROR: Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.
2020-12-08 14:57:44.611999 | controller | WARNING: You are using pip version 20.2.4; however, version 20.3.1 is available.
2020-12-08 14:57:44.612057 | controller | You should consider upgrading via the '/usr/bin/python3.6 -m pip install --upgrade pip' command.

[serenico (federico-ressi)]

I submitted a fix to master branch: https://review.opendev.org/c/openstack/devstack/+/766740/5