tests: cleanup: drop upgrade/jewel-x/point-to-point-x

tests: cleanup: drop upgrade/jewel-x/point-to-point-x

This subsuite is only for testing upgrades from one jewel
point release to another. In luminous and master it serves no
useful purpose.

Fixes: http://tracker.ceph.com/issues/22888
Signed-off-by: Nathan Cutler <ncutler@suse.com>
(cherry picked from commit bc9b2e6c898d495b4eb3304b6128dd1292a212cc)

Conflicts:
    qa/suites/upgrade/jewel-x/point-to-point-x/point-to-point-upgrade.yaml
       This file has different content than in master, due to the following
       three luminous-only fixes:
           61e4de133d9fa1eddcd858152b7828515e0b280f
           e50af8bb04bd37bd0e28ddc7935e29bcdc106b05
           ee02b5c037c67c708335745898328e990ecacc90