Write safe.directory items to system git config

This is necessary for more consistent behavior across multiple
distro versions. Apparently somewhere along the way, git started
looking at the current user's home directory instead of $HOME.

Related-Bug: https://bugs.launchpad.net/devstack/+bug/1968798

Change-Id: I941ef5ea90970a0901236afe81c551aaf24ac1d8
2 files changed