bab2a12 osbs: Make git_branch required option

Authored and Committed by lsedlar 6 years ago
    osbs: Make git_branch required option
    
    In order to avoid conflicting tags, OSBS allows only one build for a
    repo/branch pair at the same time. To avoid race conditions, we should
    make sure we always pass in the branch. This commit makes it a required
    option.
    
    Signed-off-by: Lubomír Sedlář <lsedlar@redhat.com>
    
        
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