JDBC: Provide a way for JDBC users to pass cookie info via connection string

Some authentication mechanisms like Single Sign On, need the ability to pass a cookie to some intermediate authentication service like Knox via the JDBC driver. We need to add the mechanism in Hive's JDBC driver (when used in HTTP transport mode).

Cookies can now be passed like:

jdbc:hive2://<host>:<port>/<db>;transportMode=http;httpPath=<http_endpoint>;http.cookie.<name1>=<value1>;http.cookie.<name2>=<value2>