feat: add command clusterset remove

[ycyaoxdu]

help remove cluster from clusterset

Signed-off-by: ycyaoxdu [email protected]

[openshift-ci]

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[ycyaoxdu]

@qiujian16 please help to review, thanks.

[qiujian16]

should this be clusteradm delete clusterset ?

[ycyaoxdu]

should this be clusteradm delete clusterset ?

this command clusteradm clusteset remove is meant to remove a cluster from a clusterset. which is an option in a clusterset, just like the clusteradm clusterset add .

from my opinion, clusteradm delete clusterset means to delete a clusterset. we may also need clusteradm delete clusterset to delete a specified clusterset?

[ycyaoxdu]

#151