Closes-Bug: #1827844
Part of bp support-to-query-nova-resources-filter-by-changes-before

Change-Id: I4f28168188973730247bcbcb70ba0e70eb81e3be

Per the discussion at the Train Forum [1] this deprecates
the problematic --live option on the server migrate command
which, depending on the compute API version used, forcefully
bypasses the scheduler and also does not allow you to live
migrate a server and let the scheduler pick a host.

The --live option is replaced here with two new options:

* --live-migration: this simply tells the command you want to
  perform a live rather than cold migration; if specified with
  --live the --live-migration option takes priority.

* --host: when specified, this will request a target host for
  the live migration and will be validated by the scheduler;
  if not specified, the scheduler will pick a host. This option
  is mutually exclusive with --live.

We can build on the --host option by supporting cold migrations
with a specified host when using compute API version 2.56 or
greater but that will come in a separate change.

If the --live option is ever used we log a warning.

Note there are several related changes for this issue:

- https://review.openstack.org/#/c/628334/
- https://review.openstack.org/#/c/626949/
- https://review.openstack.org/#/c/627801/
- https://review.openstack.org/#/c/589012/
- https://review.openstack.org/#/c/460059/

This change allows us to deprecate the --live option and provide
a replacement which is backward compatible without having to use
something potentially error-prone like nargs='?'.

Closes-Bug: #1411190

[1] https://etherpad.openstack.org/p/DEN-osc-compute-api-gaps

Change-Id: I95d3d588e4abeb6848bdccf6915f7b5da40b5d4f

This patch adds functionality to configure server's description with:
1 server create
2 server set
3 server unset
4 server rebuild

Change-Id: Ic06d97b29e51828b29d7ac5172645c288e4ada9e
Story: 2002005
Task: 19640

This patch explicitly points out the change needed while
forming the detailed lists for servers. In those cases
where the server response for ``openstack server list``
has the flavor and image keys missing for the instances
in the down cell, the servers will be skipped from being
processed.

Depends-On: https://review.openstack.org/591657/
Related to blueprint handling-down-cell
Change-Id: Ibcfe9febdc45db1cb86c6e88f65976feceb01c02

since nova api 2.40 the os-simple-tenant-usage API supports pagination
and will by default return a number of entities configured internally in
Nova.
This means that when there are many enough projects,
the single call to usage.list() will not return usages for all projects.

This patch effectively copy-pastes the logic to paginate over usage list
results from novaclient/v2/shell.py code.

Change-Id: I1b639fe386b7b7db3223f6965495094b9d51533a
Story: #2005099
Task: #29713