Set notification settings in .asf.yaml

Adds specific notification settings in the asf.yaml configuration.

Diverts messages regarding new commits being pushed to the 'jdo-commits'
mailing list to avoid clogging up 'jdo-dev'. The notifications for
pull-requests and issues still go to 'jdo-dev'.

Adds the preexisting jira linking options to the configurations. With
the current configuration, the label 'pull-request-available' and a link
to the pull-request/issue is automatically added to any Jira ticket that
is referenced in the pull-request/issue name. See wiki for more details.
diff --git a/.asf.yaml b/.asf.yaml
index fccdcd8..b7d1f22 100644
--- a/.asf.yaml
+++ b/.asf.yaml
@@ -18,3 +18,9 @@
   protected_branches:
     publish:
       allow_force_pushes: true
+
+notifications:
+  commits:      jdo-commits@db.apache.org
+  issues:       jdo-dev@db.apache.org
+  pullrequests: jdo-dev@db.apache.org
+  jira_options: link label