resize command should work without ssh

[Lars]

Description
===========
VM resizing should work without ssh connections between compute nodes if they have the same shared storage.

One option is to pass an additional argument if it's a resize on a shared storage. The same functionality is already implemented for vm migrations.

Expected result
===============
Resizing on shared storage works without ssh connections between compute nodes.

Actual result
=============
Resizing fails, because it requires an ssh connection between the source and target host.

Environment
===========
1. Openstack version:
nova-api 2:16.0.3-0ubuntu1~cloud0
nova-common 2:16.0.3-0ubuntu1~cloud0
nova-conductor 2:16.0.3-0ubuntu1~cloud0
nova-consoleauth 2:16.0.3-0ubuntu1~cloud0
nova-novncproxy 2:16.0.3-0ubuntu1~cloud0
nova-placement-api 2:16.0.3-0ubuntu1~cloud0
nova-scheduler 2:16.0.3-0ubuntu1~cloud0
python-nova 2:16.0.3-0ubuntu1~cloud0
python-novaclient 2:9.1.0-0ubuntu1~cloud0

2. Hypervisor:
Libvirt + KVM

[Sylvain Bauza (sylvain-bauza)]

That's not really a bug, right ? It's more about asking to have a new possibility for resize, hence what we call a feature.

Please rather see https://docs.openstack.org/nova/latest/contributor/process.html#overview about our process, and create a new blueprint if you want so.