Remove legacy-devstack-dsvm-py36-updown-fedora-26
Because we are moving to fedora-27, it doesn't make much sense to run
this job, as everything is python3 now.
irrelevant-files:
- ^.*\.rst$
- ^doc/.*$
- - legacy-devstack-dsvm-py36-updown-fedora-26:
- branches: ^(?!stable)
- irrelevant-files:
- - ^.*\.rst$
- - ^doc/.*$
- legacy-tempest-dsvm-cells:
irrelevant-files:
- ^.*\.rst$
