ibus-keyman depends on keyman-keyboardprocessor which we don't
build for s390x because we currently don't support big-endian.
We only build for the same architectures as keyman-keyboardprocessor.
This is a cherry-pick of PR#4223:
- Add script to create debian source package
- Update debian metadata based on Debian repos
- Remove some lintian warnings and errors
- Remove support Xenial
- Reduce size of icon
- Omit confusing values from gbp.conf
* keyboardprocessor shouldn't be reconfd on jenkins
update launchpad script for disco and new packages
* removed deprecated actions
* add new About Keyman to package descriptions