The cells architecture of doing db replay makes this call
fundamentally racey for cells. The contract is that if you request an
action on a server and it is locked, you get a 409 at the API, and are
done. If you get a 2xx, the resource is not locked, and life is good.
Except in cells, the API db will be updated, and the API will return
all is well. Except the db replay hasn't happened for the cell, so the
additional check in the nova compute for locked blows up.
The fix probably involves the nova-compute check doing a timed retry
under cells because of replication lags.
Conflicts:
devstack/tempest-dsvm-cells-rc
NOTE(mriedem): The conflict is due to an additional test being
skipped in liberty that wasn't skipped in mitaka.
Change-Id: Ic18407b8372c286d8e258860f3e2bf76eceef2aa
Related-Bug: #1466696
(cherry picked from commit 02de17c72a)
d836c7172d