New submit repo for hotspot changes

[mark.reinhold at oracle.com]

2018/3/13 8:02:15 -0700, jesper.wilhelmsson at oracle.com:
> The sync is done via an hg hook that pushes directly to the submit-hs
> repo as soon as anything enters hs, so it would be a matter of minutes
> at most.  /Jesper

It should typically be nearly instantaneous.  When you push a changeset
to jdk/hs, the Mercurial server runs a post-transaction hook that pushes
the changeset over to jdk/hs-submit.  That's why you'll now see a bit
more output when you push to jdk/hs:

  $ hg push
  pushing to ssh://hg.openjdk.java.net/jdk/hs
  searching for changes
  remote: adding changesets
  remote: adding manifests
  remote: adding file changes
  remote: added 1 changesets with 5 changes to 5 files
  # new output here:
  remote: pushing to /hg/jdk/submit-hs
  remote: searching for changes
  remote: adding changesets
  remote: adding manifests
  remote: adding file changes
  remote: added 1 changesets with 5 changes to 5 files
  remote: branch-only check passed
  remote: notifying jdk-submit-changes at openjdk.java.net
  remote: pushed update to /hg/jdk/submit-hs
  remote: notifying jdk-all-changes at openjdk.java.net, jdk-hs-changes at openjdk.java.net
  $ 

- Mark