Store a key value.

def store(bank, key, data):
    '''
    Store a key value.
    '''
    c_key = '{0}/{1}'.format(bank, key)
    try:
        c_data = __context__['serial'].dumps(data)
        api.kv.put(c_key, c_data)
    except Exception as exc:
        raise SaltCacheError(
            'There was an error writing the key, {0}: {1}'.format(
                c_key, exc
            )
        )