bugfix: get rollout always return not found except default namespace

[zcc35357949]

Signed-off-by: zhouchencheng zhouchencheng@bilibili.com

affected by #932, rollout cli can not get rollout in other namespaces except default.

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• Either (a) I've created an enhancement proposal and discussed it with the community, (b) this is a bug fix, or (c) this is a chore.
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[zcc35357949]

@zhaoyun006

[jessesuen]

Thank you!