JDK 11.0.3 Update process

[Rob McKenna]

> OK, and if hgupdater finds that there already exists a JBS backport item for a distinct bug for the distinct version of the repository, I assume it is smart enough not to create an additional JBS item?

In this case I believe it should add comments to the existing bug. Note:
if the bug is already in the stabilization repo, that would imply it was
pushed before the fork. It would be strange to need to push another
changeset with the same id to the same repo. (unless I misunderstand the
question)

    -Rob