Configuring Impyla for authentication

You can connect Impyla to the Impala Virtual Warehouse using the HTTP transport protocol and JWT as the authentication mechanism.

In a terminal window, as a client, you run the command provided by the Impala Virtual Warehouse owner to update Impyla to the version compatible with the Impala Virtual Warehouse.
```
 pip install impyla==0.18.0 
```
Connect Impyla to the Impala Virtual Warehouse using a connection string as described below:
- host=Name of your Virtual Warehouse host
- port=Virtual Warehouse port
- use ssl=true
  CDW only provides a TLS endpoint, it does not provide an unencrypted endpoint. Also, not using TLS will expose the JWT in plain text.
- http_transport=True
  The http transport is required by Impala for JWT authentication.
- jwt=<JWT token>
  Substitute your JWT token, which you copied earlier, for <JWT Token>.
- http_path="cliservice"
  Required.
```
self.connection = connect(<ENV>.host, <ENV>.http_port, use_http_transport=True,
http_path="cliservice", 
auth_mechanism="JWT",
timeout=5, jwt=<JWT Token>)
```
On the client side, you can now run queries from Impyla on the Impala Virtual Warehouse.