pacific: vstart: check mgr status after starting mgr

[Svelar]

Backport of #49763

Signed-off-by: Rongqi Sun sunrongqi@huawei.com
(cherry picked from commit bdd7dd1)

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[ljflores]

Rados suite review: https://tracker.ceph.com/projects/rados/wiki/PACIFIC#httpstrellocomcqQnRTrLO1792-wip-yuri8-testing-2023-06-22-1309-pacific-old-wip-yuri8-testing-2023-06-22-1004-pacific-old-wip-yuri8-testing-2023-06-22-0834-pa