vici: Update Python build

Directly calling setup.py is deprecated (apparently has been for a while,
but now we get large warnings).  Direct installation is also discouraged.
So this removes that option.  The built wheel (the old egg format is not
used/built anymore) can be installed manually in a venv or the like.

src/libcharon/plugins/vici/python/.gitignore

@@ -1,3 +1,4 @@
+.eggs
 .tox
 *.pyc
 build