Add HTTP set_auth_type() - set type of the server authentification. Don'...

Added additional flag ```auth_type``` in the ```Http``` class.
This flag sets server authorization type and disables automatic detection for each request because I send 50000 requests and I don't need authorization type detection requests in the same amount. Each request has unique URI - this is the REST API requests.
Therefore I set server authorization type directly with the call ```self.http_client.set_auth_type("basic")```.