[rally] remove legacy-rally-dsvm-magnum-rally job
With we have a new Zuul V3 job,
no need in old legacy job.
Needed-By:
- ^tests/hacking/.*$
- ^tests/unit/.*$
- ^tox.ini$
- - legacy-rally-dsvm-magnum-rally:
- voting: false
- irrelevant-files:
- - ^.*\.rst$
- - ^Dockerfile$
- - ^doc/.*$
- - ^etc/.*$
- - ^tests/hacking/.*$
- - ^tests/unit/.*$
- - ^tox.ini$
- legacy-rally-dsvm-neutron-existing-users-rally:
irrelevant-files:
- ^.*\.rst$
