[LibOS] Get proper distlib path for python apps on Fedora and Ubuntu

[stefanberger]

The distlib path for python apps differs by distro like this:

• Ubuntu: /usr/lib/python3/dist-packages
• Fedora: /usr/lib64/python3.9/site-packages

This patch now builds these paths and only returns them if the directory exists. The order in which we try things is important because on Ubuntu /usr/lib/python3.6/site-packages may exist but on Fedora /usr/lib/python3/dist-packages does not exist.

Signed-off-by: Stefan Berger [email protected]

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This change is 

[stefanberger]

@woju This should fix the regression.

[mkow]

Jenkins, test this please