pyScss tries to import a module called "Feature" from setuptools,
which was removed from setuptools 46.0.0 (mar 8 2020). This causes
compilation erros. The fix updates "pip install" in Dockerfile
to install setuptools < 46.0.0
Change-Id: Ib5c00aafb934efaf1413e72ede30638f2dc35230
Signed-off-by: Davlet Panech <davlet.panech@windriver.com>
Closes-Bug: 1866699