Comment 4 for bug 1718295

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Matt Riedemann (mriedem) wrote : Re: Unexpected exception in API method: MigrationError_Remote: Migration error: Disk info file is invalid: qemu-img failed to execute - Failed to get shared "write" lock\nIs another process using the image?

It's probably this change to devstack to use the pike cloud archive:

https://review.openstack.org/#/c/501224/