python-logilab: update pip and add pip-tools for pip-compile

Pip latest version generally has some good improvement and we are starting to use pip-compile at least to pre-check that we don't have incompatible versions in our requirements (with the new template job "check-dependencies-resolution")

library/python-logilab/Dockerfile

 ARG version="latest"
 FROM python:"${version}"
-RUN pip install tox
+RUN pip install -U pip
+RUN pip install tox pip-tools