Format the job instance correctly

def _format_job_instance(job):
    '''
    Format the job instance correctly
    '''
    ret = {'Function': job.get('fun', 'unknown-function'),
           'Arguments': salt.utils.json.loads(job.get('arg', '[]')),
           # unlikely but safeguard from invalid returns
           'Target': job.get('tgt', 'unknown-target'),
           'Target-type': job.get('tgt_type', 'list'),
           'User': job.get('user', 'root')}
    # TODO: Add Metadata support when it is merged from develop
    return ret