Matt Riedemann 92fed02610 Block deleting compute services with in-progress migrations ...

This builds on I0bd63b655ad3d3d39af8d15c781ce0a45efc8e3a
which made DELETE /os-services/{service_id} fail with a 409
response if the host has instances on it. This change checks
for in-progress migrations involving the nodes on the host,
either as the source or destination nodes, and returns a 409
error response if any are found.

Failling to do this can lead to orphaned resource providers
in placement and also failing to properly confirm or revert
a pending resize or cold migration.

A release note is included for the (justified) behavior
change in the API. A new microversion should not be required
for this since admins should not have to opt out of broken
behavior.

Change-Id: I70e06c607045a1c0842f13069e51fef438012a9c
Closes-Bug: #1852610

2019-11-14 14:29:58 -05:00

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