Get the full path of a cached CIB-file with the name of the CIB

def _get_cibfile(cibname):
    '''
    Get the full path of a cached CIB-file with the name of the CIB
    '''
    cibfile = os.path.join(_get_cibpath(), '{0}.{1}'.format(cibname, 'cib'))
    log.trace('cibfile: %s', cibfile)
    return cibfile