Export files required by OPT to load the tokenizer

[dbogunowicz]

OPT does not contain a "tokenizer.json", but instead requires the following files:
"special_tokens_map.json"
"vocab.json"
"merges.txt"
to create the tokenizer from pretrained.

I.e if those three files are present in the deployment model this line of code will execute:

model_path = "deployment"
tokenizer = AutoTokenizer.from_pretrained(
            model_path,
        )