Support to get resource by id to avoid finding in list loop

[Rui Chen]

For finding specified resource, we list all the resources in get_xxx(name_or_id) method, then find the result in list result loop, that might have poor performance and slow response when there are many resources in a project. OpenStack API support to get resource by id directly, and part of them had been implemented in Shade, like: get_server_by_id(), get_user_by_id(), get_volume_snapshot_by_id.

Aims to support more:

- flavor
- image
- volume
- network
- subnet
- port
- floatingip
- security group
- ...

[Rui Chen (kiwik-chenrui)]

Add patch link:
    https://review.openstack.org/#/c/492080/

[Rui Chen (kiwik-chenrui)]

Patch https://review.openstack.org/#/c/492080/ had been merged into master.

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack-infra/shade 1.23.0 release.

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/python-openstacksdk 0.10.0 release.