RethinkDB 2.3 handshake V1.0 implementation

Connect to RethinkDB failed when host configured with user permissions. 

Links:
- https://rethinkdb.com/docs/writing-drivers/
- https://github.com/rethinkdb/rethinkdb/blob/next/drivers/java/src/main/java/com/rethinkdb/net/Handshake.java

Some workaround:
Use admin password in 'auth-key' connect parameter.
