transaction method do not use ACL token

[jackzzheng]

I'm getting the following error when using the txn method of the client.

ClientError: 409 {"Results":null,"Errors":[{"OpIndex":0,"What":"Permission denied"}]}

even though the client was initialized with the correct token. Using the consul http api with the same token works.

[poppyred]

@jackzzheng The author may be a little busy, I will maintain a version python-consul2 welcome to use. The new consul version was used. Progressively implement all API interfaces in the future