The commit c1ccc1a3165ec1556c605b3b036274e992b0a09d introduced
a regression when NUMA live migration was done on shared storage
The live migration support for the power mgmt feature means we need to
call driver.cleanup() for all NUMA instances to potentially offline
pcpus that are not used any more after the instance is migrated away.
However this change exposed an issue with the disk cleanup logic. Nova
should never delete the instance directory if that directory is on
shared storage (e.g. the nova instances path is backed by NFS).
This patch will fix that behavior so live migration will function
Closes-Bug: #2080436
Change-Id: Ia2bbb5b4ac728563a8aabd857ed0503449991df1
(cherry picked from commit 035b8404fce878b0a88c4741bea46135b6af51e8)
57e037b507