Fix dependency between `version-tag` and `private-docker-publish` jobs.

ONOS CI has a version-tag job for each repo and the name of
the job is `version-tag_projectname`. This patch fixes also the issue
seen in the docker-publish that cannot find the git tag.

Change-Id: I6c1909f1ce0b8aa5a5458f8e2022b8fb8134d11b
diff --git a/jjb/repos/tost-onos.yaml b/jjb/repos/tost-onos.yaml
index 802309c..0cf2184 100644
--- a/jjb/repos/tost-onos.yaml
+++ b/jjb/repos/tost-onos.yaml
@@ -36,7 +36,7 @@
           docker-registry: 'registry.aetherproject.org'
           maintainers: 'charles@opennetworking.org, pier@opennetworking.org'
           build-timeout: 30
-          dependency-jobs: 'version-tag'
+          dependency-jobs: 'version-tag_tost-onos'
 
 - job-group:
     name: 'release-tost-onos-jobs'