[DRBD-announce] python-linstor/linstor-client 1.20.0 release

Hi,

Here is the python-linstor and linstor-client release, bringing small
features for the upcoming linstor-server 1.25.0 release

## linstor-client
### Added

- Show skip-disk property and level resource list

### Changed

- Typo in remote command argument --availability-zone

### Fixed

- Fixed exos help message
- Show deleting state for DRBD_DELETE flag
- Fixed resource involved command AttributeError

https://pkg.linbit.com//downloads/linstor/linstor-client-1.20.0.tar.gz

## python-linstor
### Added

- Add EffectiveProps structure

### Changed

- Updated linstor-common code

https://pkg.linbit.com//downloads/linstor/python-linstor-1.20.0.tar.gz

Linstor PPA:
https://launchpad.net/~linbit/+archive/ubuntu/linbit-drbd9-stack

Best regards,
Rene