setuptools >48.0.0 fail devstack on pip installed path

[Ghanshyam Mann]

with new setuptools 48.0.0, devstack started failing on
 - usr/local/bin/keystone-manage: No such file or directory"

https://zuul.opendev.org/t/openstack/build/55e53d1c37194d8992f79a4090da86ee/log/job-output.txt#10572

Clark found that this issue happening with 'pip install -e' - http://lists.openstack.org/pipermail/openstack-discuss/2020-July/015779.html

We are not sure if that is bug on setuptools side or it is incompatible change and we need to remove the usage of 'pip install -e' from devstack.

[Ghanshyam Mann (ghanshyammann)]

setuptools issue reported -https://github.com/pypa/setuptools/issues/2232

[Ghanshyam Mann (ghanshyammann)]

Its reproduced setuptools side. setuptools (48.0.0 onwards) adopt the distutils from std lib but customized version of ubuntu distutils are lost. setuptools 49.1 has disabled the distutils adoption and gate is working fine with that - https://review.opendev.org/#/c/739294/1

There is nothing to do on devstack for now, let's close this and keep eyes on https://github.com/pypa/setuptools/issues/2232