release: Merge default into stable for release preparation

git-hooks: store git-env into hooks, so we can use the sandbox storage area, and execute rcextension pre-commit hooks, to read not yet commit objects in GIT.

hooks: adjust to handle protected branch cases, and force push.

dependencies: bumped setuptools to 40.1.0

locale: use a hacky way to catch the locale set error. We rather "cleanup" the env ourselfs then make it fatal crash. This could be removed when glibc situation gets stable.

dependencies: added setuptools

dependencies: bumped some loose libraries: - scandir to 1.9.0 - beautifulsoup4 to 4.6.3

git: allow head command to not raise exception is we wish to have only return value.

packages: normalize package emails.

tests: don't use sugar for make triggered tests.