Changes

scripts/common: osmo_git_clone_url: add pyosmocom

Add the location of pyosmocom. Fix for the currently failing
Osmocom-release-manuals job:

  :: (pyosmocom) Getting git tags
  fatal: unable to access 'https://gerrit.osmocom.org/pyosmocom/': The requested URL returned error: 403

Change-Id: I63a23a831b6091967e4944af4ad8643ec0fe1f63