2895: remove users.event_stream api
2895: remove jobs.log_tail_follow api since we are now using websockets instead of redis
Merge branch 'master' into 2895-no-more-redis
2895: remove redis gem
Merge branch 'master' into 2895-no-more-redis
Merge branch 'master' into 2895-no-more-redis
2895: remove arvados.jobs.log_stream from arv
Merge branch 'master' into 2895-no-more-redis