Supervisor: implement rolling_update

[openinx]

Currently, our supervisor will do nothing if call rolling_update. need to implement this.

func (p *Program) rollingUpdate(s *Supervisor) error {
	// TODO
	return nil
}

[openinx]

After the commit, we can use the following command to update config files and packages:

./bin/huker rolling_update  --project hbase --cluster test-hbase --job master