findmissing: git_interface: Implement get_tag_emails_linux_chrome() API function

get_tag_emails_linux_chrome() returns a list of e-mails associated with
tags found after a "cherry picked from commit" message in the commit
log.

BUG=None
TEST=Run on GCE

Change-Id: I3bfecdbfd218364bfe2ba271a572c3860dbdfe24
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/dev-util/+/2197185
Reviewed-by: Curtis Malainey <cujomalainey@chromium.org>
Commit-Queue: Guenter Roeck <groeck@chromium.org>
Tested-by: Guenter Roeck <groeck@chromium.org>
1 file changed