Kzl 998 strategies in redis

[benoitvidis]

What does this PR do ?

This PR is the fixed version of https://github.com/kuzzleio/kuzzle-plugin-cluster/pull/74 which, in its original version, would remove the strategies loaded at Kuzzle start -_-;....

How should this be manually tested?

1. check the local strategy is still working, for instance by using the admin console
2. test "on-the-flight" strategies addon and removal:
   • Add this small plugin to your cluster: https://gist.github.com/benoitvidis/a5d9bd592a261d7b903209e73abed59d
   • Check the dummy strategy does not exist by trying to log in
   • Call http://localhost:7512/_plugin/test/do/bar
   • Check the dummy strategy is known on all nodes
   • Call http://localhost:7512/_plugin/test/do/foo
   • Check the dummy strategy has been deleted from all nodes

Additionally, you can run kuzzle functional tests:

1. switch Kuzzle version to https://github.com/kuzzleio/kuzzle/pull/1284
2. from kuzzle directory, run ./node_modules/.bin/cucumber-js --profile websocketNoRedis

Boyscout

dependencies upgrade.

[codecov-io]

Codecov Report

Merging #76 into 3-dev will increase coverage by 1.03%. The diff coverage is 86.11%.

@@            Coverage Diff             @@
##            3-dev      #76      +/-   ##
==========================================
+ Coverage   57.03%   58.07%   +1.03%     
==========================================
  Files           4        4              
  Lines         533      539       +6     
==========================================
+ Hits          304      313       +9     
+ Misses        229      226       -3

Impacted Files	Coverage Δ
lib/redis/manager.js	33.33% <0%> (+2.18%)	:arrow_up:
lib/index.js	50.36% <100%> (+1.29%)	:arrow_up:
lib/node.js	77.38% <90.9%> (-0.17%)	:arrow_down:

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