[MDEV-8244] Buildbot imprevements - JIRA

Details

Various buildbot improvements for faster turn-around and greener builds:

remove bzr (and 5.1–5.3) from buildbot config
general buildbot config cleanup
- use make test-xxx targets instead of hard-coding mtr lines in the buildbot config. this way anyone can easily run the same set of tests. debian rules file should be updated to use that too.
fix the upload issue, build slaves should not upload packages to hasky
- instead they should store (and server) them locally, and only create redirects from hasky/archive to the actual location.
after uploads are fixed, deploy MDEV-5776, may be on a separate builder, like, quicktest
then consider doing autopush like configuration:
- separate repository (server-releases?)
- a pull builder that is only triggerable manually, and fast-forwards e.g. 10.0 up to the manually specified branch
- pull builder triggers quicktest, windows, a couple of packagers
- a new dependent builder waits for others to succeed and pushes the result to github
- optionally, updates pushed MDEVs from "Building" to "Closed"
- and emails the developer
- note that ideally there is no need to run buildbot on server-releases repo, as all pushes there are fast-forwards from already buildbot approved branches.

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