Matt Riedemann 622a0ff424 api-ref: clarify retype docs around default policy permissions
Cinder's default policy allows the owner of a volume to initiate
a retype, even if they aren't an admin. However, if the volume
is going to be migrated during the retype operation, then Cinder
is going to call the Nova swap volume API, which by default is
admin-only. So if a non-admin user tries to retype and migrate
their volume, which is attached to a server instance, then it's
going to fail with a 403 error from Nova.

En lieu of a more complete solution, like Cinder using an
elevated service token to call Nova, this change just attempts
to document the restriction in the API reference.

Change-Id: I6282a6d319beead979780a33880947987906c2f3
Related-Bug: #1698224
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CINDER

You have come across a storage service for an open cloud computing service. It has identified itself as Cinder. It was abstracted from the Nova project.

Getting Started

If you'd like to run from the master branch, you can clone the git repo:

git clone https://git.openstack.org/openstack/cinder.git

For developer information please see HACKING.rst

You can raise bugs here http://bugs.launchpad.net/cinder

Python client

https://git.openstack.org/cgit/openstack/python-cinderclient

Description
OpenStack Block Storage (Cinder)
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