GitLab

refs FOO-1636
flag=none
[fsc-propagate=false]

- add gem initializer to canvas for canvas_cache
- move Canvas::Redis into canvas_cache
- alias module in canvas
- expand dependencies of canvas_cache
- add redis dependency to vendored gem environment
- extract RedisConnections to deal with disconnect/clear_idle

TEST PLAN:
  1) continue to cache things in redis
  2) caching behavior with canvas-extensions
     should not change

Change-Id: I96383eced80d670e14e535993f0c0608ab5f6520
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/259434

Tested-by: Service Cloud Jenkins <svc.cloudjenkins@instructure.com>
Reviewed-by: Simon Williams <simon@instructure.com>
QA-Review: Ethan Vizitei <evizitei@instructure.com>
Product-Review: Ethan Vizitei <evizitei@instructure.com>