Open the connection to the Arista switch over the eAPI.

def init(opts):
    '''
    Open the connection to the Arista switch over the eAPI.
    '''
    proxy_dict = opts.get('proxy', {})
    conn_args = proxy_dict.copy()
    conn_args.pop('proxytype', None)
    opts['multiprocessing'] = conn_args.get('multiprocessing', True)
    # This is not a SSH-based proxy, so it should be safe to enable
    # multiprocessing.
    try:
        conn = pyeapi.client.connect(**conn_args)
        node = pyeapi.client.Node(conn, enablepwd=conn_args.get('enablepwd'))
        pyeapi_device['connection'] = node
        pyeapi_device['initialized'] = True
        pyeapi_device['up'] = True
    except pyeapi.eapilib.ConnectionError as cerr:
        log.error('Unable to connect to %s', conn_args['host'], exc_info=True)
        return False
    return True