[JIRA] (OVIRT-2500) Support for notifications configuration in STDCI DSL

Support for notifications configuration in STDCI DSL ---------------------------------------------------- Key: OVIRT-2500 URL: https://ovirt-jira.atlassian.net/browse/OVIRT-2500 Project: oVirt - virtualization made easy Issue Type: New Feature Reporter: Daniel Belenky Assignee: infra As a developer, I want to have the ability to configure different aspects of the CI system's notifications: who receives the notifications (the change/tag owner, list of maintainers, etc), what kind of notifications are sent (notify SCM, notify mail, etc) so that I wont miss important events in my proejct.