Replace the legacy git.osmocom.org clone URLs with either gerrit or
gitea in most places. Besides not using legacy urls anymore, the
advantage of using gerrit directly is that we don't have a delay of 10
min to several hours on the repository.
Not replaced:
* ansible/roles/osmocom-workstation: not sure if still used, would need
a bit of a rewrite to use logic similar to osmo_git_clone_url().
Related: https://osmocom.org/projects/cellular-infrastructure/wiki/Git_infrastructure
Change-Id: I90409c9e7f4db4e1765647021625f9acfccaa78b