Issue #3402291 by Xiaohua Guan, yas: Fix an error that prevents detaching...

xiaohua guanrequested to merge
issue/cloud-3402291:3402291-fix-an-error into 6.x

Issue #3402291 by Xiaohua Guan, yas: Fix an error that prevents detaching OpenStack network interface

Closes #3402291

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