[JIRA] (OVIRT-1050) Allow manual mirror manipulation for jobs

Allow manual mirror manipulation for jobs ----------------------------------------- Key: OVIRT-1050 URL: https://ovirt-jira.atlassian.net/browse/OVIRT-1050 Project: oVirt - virtualization made easy Issue Type: Improvement Components: Repositories Mgmt Reporter: Barak Korren Assignee: infra Right now all jobs that use the mirrors simply take the latest mirrors available when they get invoked. Sometime we may want to manually configure which mirror snapshots are used for a particular job. We should add job parameters and functionality to allow this.