Queue controller and related cli

[k82cn]

Currently, user can only create a Queue for scheduling; but it's hard to know more info about it, e.g. how many job in the queue, which plugins is used by this queue; and if the Queue is deleted, the job is still there :( It's better to have QueueController to mamange Queue's lifecycle and update its status; and have related command line for uset to get its info.

[k82cn]

/assign @hzxuzhonghu

[hzxuzhonghu]

@k82cn I would make queueController in the same process with job controller, is this ok?

[k82cn]

I would make queueController in the same process with job controller, is this ok?

That's ok to me; similar to kube-controller-manager :) BTW, we have a cache in pkg/controller; please reuse it if necessary :)