apply-pull: Never rebase git pull, never rebase

We should never run the pull with the rebase strategy. Ever.

That messes up with our commits. Specially with the top
one where dim expects a merge commit and it amends from and
link info.

So, let's forbid the rebase strategy overriding any user
config.

Cc: Jani Nikula <jani.nikula@intel.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Zhi Wang <zhi.a.wang@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
3 jobs for master in 37 seconds (queued for 2 seconds)