[from osgraph] Parameters not available in cypher plugin calls

[ljcui]

example

    query = "call db.plugin.callPlugin('CPP','add_vertexes',$data, 0.0, false)"
    data = 'test data'
    try:
        ret = session.run(query, data = data)
        for item in ret.data():
            print(item)
    except Exception as e:
        print(e)

response

{code: ReminderException} {message: param type should be string}

[ljcui]

needed by osgraph