qa/suites: clean up client-upgrade-octopus-pacific test

qa/suites: clean up client-upgrade-octopus-pacific test

- fix .qa symlinks
- rename nautilus-client-x.yaml to octopus-client-x.yaml
- fix typos and remove stale comment
- remove 2-features permutation (it doesn't do anything useful as the
  workunit is run with RBD_FEATURES environment variable set and those
  features are explicitly passed to RBD.create and RBD.clone calls;
  the net effect is that the exact same job is run twice)

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>