findmissing: Add pre-existing Change-Id to new commits

In some cases a patch is already present in Gerrit. If so, use existing
Change-Ids to create new commits. This enables Gerrit to show commits into
multiple branches in a single UI instance.

BUG=None
TEST=Apply same commit to multiple branches

Change-Id: I6cc9285066cbdc6506cca45139974406acfe9191
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/dev-util/+/2280246
Commit-Queue: Guenter Roeck <groeck@chromium.org>
Tested-by: Guenter Roeck <groeck@chromium.org>
Reviewed-by: Curtis Malainey <cujomalainey@chromium.org>
2 files changed