Automate Artifact release

This will be adapted to work for ONAP/Other projects
once we are okay with this.

projects that want self-serve releases will create a
tagname.yaml file in the releases/ directory of their git repo.

Here is the change I have been testing in the sandbox
https://git.opendaylight.org/gerrit/#/c/80613/

example of a releases file:
$ cat releases/1.0.0.yaml
---
distribution_type: 'maven'
version: '1.0.0'
project: 'zzz-test-release'
log_dir: 'zzz-test-release-maven-stage-master/17/'
maven_central_url: 'oss.sonatype.org'

Issue: RELENG-1657

Change-Id: I02dc935a84425d194cdd8eaabe5b43c5920ce319
Signed-off-by: Aric Gardner <agardner@linuxfoundation.org>