Prepare for a single branch on gerrit

Discourage all direct pushes to the upstream repositories, no matter the
branch. Also, skip adding Change-Ids to fixup! and squash! commits.

Change-Id: I13aa478edd200ce85da86962e4f94f7ac446b05f
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/22330
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
2 files changed